| Value | Category | Cases | |
|---|---|---|---|
| 1983 | 1 |
0.5%
|
|
| 1986 | 1 |
0.5%
|
|
| 1990 | 1 |
0.5%
|
|
| 1991 | 4 |
1.9%
|
|
| 1992 | 17 |
8.1%
|
|
| 1993 | 16 |
7.6%
|
|
| 1994 | 13 |
6.2%
|
|
| 1995 | 15 |
7.1%
|
|
| 1996 | 20 |
9.5%
|
|
| 1997 | 18 |
8.6%
|
|
| 1998 | 18 |
8.6%
|
|
| 1999 | 25 |
11.9%
|
|
| 2000 | 20 |
9.5%
|
|
| 2001 | 25 |
11.9%
|
|
| 2002 | 16 |
7.6%
|
|
| Sysmiss | 1572 |