| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 |
4.5%
|
|
| 2005 | 4 |
18.2%
|
|
| 2006 | 9 |
40.9%
|
|
| 2007 | 8 |
36.4%
|
|
| 9999 | 5 | ||
| Sysmiss | 4176 |