| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 13 |
6.4%
|
|
| 2008 | 33 |
16.2%
|
|
| 2009 | 43 |
21.1%
|
|
| 2010 | 65 |
31.9%
|
|
| 2011 | 49 |
24%
|
|
| 2012 | 1 |
0.5%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 424 |