| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 37 |
5.2%
|
|
| 2007 | 86 |
12%
|
|
| 2008 | 157 |
22%
|
|
| 2009 | 156 |
21.8%
|
|
| 2010 | 181 |
25.3%
|
|
| 2011 | 98 |
13.7%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 1207 |