| Value | Category | Cases | |
|---|---|---|---|
| 1979 | 1 |
0.4%
|
|
| 1985 | 1 |
0.4%
|
|
| 1986 | 1 |
0.4%
|
|
| 1988 | 5 |
1.8%
|
|
| 1989 | 4 |
1.5%
|
|
| 1990 | 4 |
1.5%
|
|
| 1991 | 15 |
5.5%
|
|
| 1992 | 15 |
5.5%
|
|
| 1993 | 15 |
5.5%
|
|
| 1994 | 22 |
8%
|
|
| 1995 | 23 |
8.4%
|
|
| 1996 | 18 |
6.5%
|
|
| 1997 | 23 |
8.4%
|
|
| 1998 | 18 |
6.5%
|
|
| 1999 | 19 |
6.9%
|
|
| 2000 | 35 |
12.7%
|
|
| 2001 | 23 |
8.4%
|
|
| 2002 | 8 |
2.9%
|
|
| 2003 | 11 |
4%
|
|
| 2004 | 6 |
2.2%
|
|
| 2005 | 5 |
1.8%
|
|
| 2006 | 3 |
1.1%
|
|
| Sysmiss | 365 |