| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 3 |
3.8%
|
|
| 2008 | 18 |
23.1%
|
|
| 2009 | 14 |
17.9%
|
|
| 2010 | 18 |
23.1%
|
|
| 2011 | 24 |
30.8%
|
|
| 2012 | 1 |
1.3%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 682 |