| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 398 |
39.7%
|
|
| 2009 | 593 |
59.2%
|
|
| 2010 | 10 |
1%
|
|
| 9999 | Missing | 1 |
0.1%
|
| Sysmiss | 12585 |