| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 41 |
2.9%
|
|
| 2007 | 220 |
15.7%
|
|
| 2008 | 291 |
20.7%
|
|
| 2009 | 338 |
24.1%
|
|
| 2010 | 366 |
26.1%
|
|
| 2011 | 148 |
10.5%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 518 |