| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
2.2%
|
|
| 2000 | 2 |
4.3%
|
|
| 2002 | 2 |
4.3%
|
|
| 2003 | 14 |
30.4%
|
|
| 2004 | 18 |
39.1%
|
|
| 2005 | 9 |
19.6%
|
|
| Sysmiss | 839 |