| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 270 |
3.7%
|
|
| 2006 | 1226 |
16.9%
|
|
| 2007 | 1415 |
19.6%
|
|
| 2008 | 1613 |
22.3%
|
|
| 2009 | 1714 |
23.7%
|
|
| 2010 | 998 |
13.8%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 4037 |