| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 377 |
2.8%
|
|
| 2009 | 608 |
4.5%
|
|
| 2010 | 9 |
0.1%
|
|
| 9999 | Missing | 3 |
0%
|
| Sysmiss | 12590 |
92.7%
|