| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 37 |
0.8%
|
|
| 2006 | 4600 |
98%
|
|
| 2007 | 2 |
0%
|
|
| 9999 | 56 |
1.2%
|
|
| Sysmiss | 538 |