| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 1 |
4.8%
|
|
| 1999 | 3 |
14.3%
|
|
| 2000 | 2 |
9.5%
|
|
| 2003 | 1 |
4.8%
|
|
| 2005 | 4 |
19%
|
|
| 2006 | 7 |
33.3%
|
|
| 2007 | 3 |
14.3%
|
|
| Sysmiss | 425 |