| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 9 |
9.1%
|
|
| 2008 | 25 |
25.3%
|
|
| 2009 | 14 |
14.1%
|
|
| 2010 | 25 |
25.3%
|
|
| 2011 | 26 |
26.3%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 661 |