| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 3 | 
                                                         
                                
                                0.1%
                                                             
                                                     | 
                                            |
| 1986 | 10 | 
                                                         
                                
                                0.5%
                                                             
                                                     | 
                                            |
| 1987 | 12 | 
                                                         
                                
                                0.6%
                                                             
                                                     | 
                                            |
| 1988 | 18 | 
                                                         
                                
                                0.9%
                                                             
                                                     | 
                                            |
| 1989 | 39 | 
                                                         
                                
                                1.9%
                                                             
                                                     | 
                                            |
| 1990 | 56 | 
                                                         
                                
                                2.7%
                                                             
                                                     | 
                                            |
| 1991 | 59 | 
                                                         
                                
                                2.9%
                                                             
                                                     | 
                                            |
| 1992 | 73 | 
                                                         
                                
                                3.6%
                                                             
                                                     | 
                                            |
| 1993 | 80 | 
                                                         
                                
                                3.9%
                                                             
                                                     | 
                                            |
| 1994 | 69 | 
                                                         
                                
                                3.4%
                                                             
                                                     | 
                                            |
| 1995 | 80 | 
                                                         
                                
                                3.9%
                                                             
                                                     | 
                                            |
| 1996 | 86 | 
                                                         
                                
                                4.2%
                                                             
                                                     | 
                                            |
| 1997 | 99 | 
                                                         
                                
                                4.8%
                                                             
                                                     | 
                                            |
| 1998 | 81 | 
                                                         
                                
                                4%
                                                             
                                                     | 
                                            |
| 1999 | 81 | 
                                                         
                                
                                4%
                                                             
                                                     | 
                                            |
| 2000 | 77 | 
                                                         
                                
                                3.8%
                                                             
                                                     | 
                                            |
| 2001 | 80 | 
                                                         
                                
                                3.9%
                                                             
                                                     | 
                                            |
| 2002 | 80 | 
                                                         
                                
                                3.9%
                                                             
                                                     | 
                                            |
| 2003 | 83 | 
                                                         
                                
                                4.1%
                                                             
                                                     | 
                                            |
| 2004 | 104 | 
                                                         
                                
                                5.1%
                                                             
                                                     | 
                                            |
| 2005 | 87 | 
                                                         
                                
                                4.3%
                                                             
                                                     | 
                                            |
| 2006 | 80 | 
                                                         
                                
                                3.9%
                                                             
                                                     | 
                                            |
| 2007 | 89 | 
                                                         
                                
                                4.4%
                                                             
                                                     | 
                                            |
| 2008 | 90 | 
                                                         
                                
                                4.4%
                                                             
                                                     | 
                                            |
| 2009 | 97 | 
                                                         
                                
                                4.7%
                                                             
                                                     | 
                                            |
| 2010 | 77 | 
                                                         
                                
                                3.8%
                                                             
                                                     | 
                                            |
| 2011 | 83 | 
                                                         
                                
                                4.1%
                                                             
                                                     | 
                                            |
| 2012 | 57 | 
                                                         
                                
                                2.8%
                                                             
                                                     | 
                                            |
| 2013 | 48 | 
                                                         
                                
                                2.3%
                                                             
                                                     | 
                                            |
| 2014 | 42 | 
                                                         
                                
                                2.1%
                                                             
                                                     | 
                                            |
| 2015 | 24 | 
                                                         
                                
                                1.2%
                                                             
                                                     | 
                                            |
| 2016 | 1 | 
                                                         
                                
                                0%
                                                             
                                                     | 
                                            |
| 9997 | Inconsistent | 0 | 
                                                         
                                
                                0%
                                                             
                                                     | 
                                            
| 9998 | Don't know | 0 | 
                                                         
                                
                                0%
                                                             
                                                     | 
                                            
| Sysmiss | 4071 |