| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 89 |
1%
|
|
| 2004 | 1135 |
12.8%
|
|
| 2005 | 1498 |
16.9%
|
|
| 2006 | 2108 |
23.8%
|
|
| 2007 | 2391 |
27%
|
|
| 2008 | 1410 |
15.9%
|
|
| 9999 | Missing | 239 |
2.7%
|
| Sysmiss | 5374 |