| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 143 |
8.4%
|
|
| 2008 | 399 |
23.4%
|
|
| 2009 | 454 |
26.6%
|
|
| 2010 | 407 |
23.9%
|
|
| 2011 | 299 |
17.5%
|
|
| 2012 | 2 |
0.1%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 628 |