| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 236 |
12.8%
|
|
| 2008 | 438 |
23.7%
|
|
| 2009 | 478 |
25.9%
|
|
| 2010 | 411 |
22.3%
|
|
| 2011 | 279 |
15.1%
|
|
| 2012 | 4 |
0.2%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 486 |