| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 270 |
2%
|
|
| 2009 | 627 |
4.6%
|
|
| 2010 | 17 |
0.1%
|
|
| 9999 | Missing | 6 |
0%
|
| Sysmiss | 12667 |
93.2%
|