| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 321 |
4.1%
|
|
| 2004 | 1023 |
12.9%
|
|
| 2005 | 1281 |
16.2%
|
|
| 2006 | 1789 |
22.6%
|
|
| 2007 | 1972 |
24.9%
|
|
| 2008 | 1190 |
15%
|
|
| 9999 | Missing | 344 |
4.3%
|
| Sysmiss | 6324 |