| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 25 |
3.7%
|
|
| 2007 | 85 |
12.5%
|
|
| 2008 | 149 |
21.9%
|
|
| 2009 | 138 |
20.3%
|
|
| 2010 | 191 |
28.1%
|
|
| 2011 | 91 |
13.4%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 1243 |