| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 41 |
2.9%
|
|
| 2007 | 220 |
15.7%
|
|
| 2008 | 292 |
20.8%
|
|
| 2009 | 340 |
24.2%
|
|
| 2010 | 365 |
26%
|
|
| 2011 | 147 |
10.5%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 517 |