| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1 |
0.1%
|
|
| 1990 | 2 |
0.2%
|
|
| 1991 | 3 |
0.3%
|
|
| 1992 | 1 |
0.1%
|
|
| 1993 | 1 |
0.1%
|
|
| 1994 | 16 |
1.7%
|
|
| 1995 | 18 |
2%
|
|
| 1996 | 13 |
1.4%
|
|
| 1997 | 7 |
0.8%
|
|
| 1998 | 23 |
2.5%
|
|
| 1999 | 33 |
3.6%
|
|
| 2000 | 69 |
7.5%
|
|
| 2001 | 36 |
3.9%
|
|
| 2002 | 45 |
4.9%
|
|
| 2003 | 50 |
5.4%
|
|
| 2004 | 147 |
15.9%
|
|
| 2005 | 457 |
49.6%
|
|
| Sysmiss | 4265 |