| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 514 |
3.8%
|
|
| 2009 | 537 |
4%
|
|
| 2010 | 11 |
0.1%
|
|
| 9999 | Missing | 3 |
0%
|
| Sysmiss | 12522 |
92.2%
|