| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 3 |
7.5%
|
|
| 2004 | 11 |
27.5%
|
|
| 2005 | 13 |
32.5%
|
|
| 2006 | 13 |
32.5%
|
|
| Sysmiss | 18426 |