| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 170 |
10.2%
|
|
| 2008 | 439 |
26.2%
|
|
| 2009 | 414 |
24.7%
|
|
| 2010 | 388 |
23.2%
|
|
| 2011 | 259 |
15.5%
|
|
| 2012 | 3 |
0.2%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 659 |