| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
1.1%
|
|
| 2000 | 2 |
2.2%
|
|
| 2002 | 1 |
1.1%
|
|
| 2003 | 1 |
1.1%
|
|
| 2004 | 1 |
1.1%
|
|
| 2006 | 4 |
4.3%
|
|
| 2007 | 7 |
7.5%
|
|
| 2008 | 22 |
23.7%
|
|
| 2009 | 54 |
58.1%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 6023 |