| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 43 |
17.6%
|
|
| 2008 | 45 |
18.4%
|
|
| 2009 | 49 |
20.1%
|
|
| 2010 | 59 |
24.2%
|
|
| 2011 | 46 |
18.9%
|
|
| 2012 | 2 |
0.8%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 516 |