| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
2.4%
|
|
| 1996 | 3 |
7.3%
|
|
| 1997 | 9 |
22%
|
|
| 1998 | 7 |
17.1%
|
|
| 1999 | 6 |
14.6%
|
|
| 2000 | 3 |
7.3%
|
|
| 2001 | 7 |
17.1%
|
|
| 2002 | 5 |
12.2%
|
|
| Sysmiss | 109 |