| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 20 |
9.1%
|
|
| 2008 | 40 |
18.2%
|
|
| 2009 | 41 |
18.6%
|
|
| 2010 | 64 |
29.1%
|
|
| 2011 | 53 |
24.1%
|
|
| 2012 | 2 |
0.9%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 408 |