| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 191 |
2%
|
|
| 2004 | 1241 |
13%
|
|
| 2005 | 1630 |
17.1%
|
|
| 2006 | 2248 |
23.6%
|
|
| 2007 | 2516 |
26.5%
|
|
| 2008 | 1542 |
16.2%
|
|
| 9999 | Missing | 144 |
1.5%
|
| Sysmiss | 4732 |