| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 193 |
55.9%
|
|
| 2009 | 130 |
37.7%
|
|
| 2010 | 5 |
1.4%
|
|
| 9999 | Missing | 17 |
4.9%
|
| Sysmiss | 13242 |