| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 5 |
21.7%
|
|
| 2004 | 3 |
13%
|
|
| 2005 | 13 |
56.5%
|
|
| 2006 | 2 |
8.7%
|
|
| Sysmiss | 9133 |