| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 193 |
6.5%
|
|
| 2009 | 427 |
14.4%
|
|
| 2010 | 999 |
33.6%
|
|
| 2011 | 1352 |
45.5%
|
|
| Sysmiss | 28053 |