| Value | Category | Cases | |
|---|---|---|---|
| 1992 | 2 |
0.6%
|
|
| 1996 | 1 |
0.3%
|
|
| 2000 | 2 |
0.6%
|
|
| 2001 | 4 |
1.3%
|
|
| 2002 | 19 |
6.1%
|
|
| 2003 | 263 |
83.8%
|
|
| 2004 | 23 |
7.3%
|
|
| Sysmiss | 7711 |