| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 398 |
2.9%
|
|
| 2009 | 593 |
4.4%
|
|
| 2010 | 10 |
0.1%
|
|
| 9999 | Missing | 1 |
0%
|
| Sysmiss | 12585 |
92.6%
|