| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 1 |
8.3%
|
|
| 1998 | 1 |
8.3%
|
|
| 2000 | 1 |
8.3%
|
|
| 2003 | 2 |
16.7%
|
|
| 2006 | 2 |
16.7%
|
|
| 2007 | 3 |
25%
|
|
| 2008 | 2 |
16.7%
|
|
| Sysmiss | 434 |