| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 514 |
48.3%
|
|
| 2009 | 537 |
50.4%
|
|
| 2010 | 11 |
1%
|
|
| 9999 | Missing | 3 |
0.3%
|
| Sysmiss | 12522 |