| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 47 |
6.2%
|
|
| 2007 | 95 |
12.6%
|
|
| 2008 | 154 |
20.4%
|
|
| 2009 | 170 |
22.5%
|
|
| 2010 | 180 |
23.8%
|
|
| 2011 | 110 |
14.6%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 1166 |