| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 |
0.5%
|
|
| 1992 | 3 |
1.4%
|
|
| 1993 | 1 |
0.5%
|
|
| 1994 | 4 |
1.9%
|
|
| 1995 | 2 |
0.9%
|
|
| 1996 | 1 |
0.5%
|
|
| 1997 | 17 |
8.1%
|
|
| 1998 | 27 |
12.8%
|
|
| 1999 | 41 |
19.4%
|
|
| 2000 | 33 |
15.6%
|
|
| 2001 | 50 |
23.7%
|
|
| 2002 | 31 |
14.7%
|
|
| Sysmiss | 16 |