| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 7 |
0.4%
|
|
| 2007 | 396 |
20.6%
|
|
| 2008 | 450 |
23.4%
|
|
| 2009 | 446 |
23.2%
|
|
| 2010 | 433 |
22.6%
|
|
| 2011 | 187 |
9.7%
|
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 413 |