| value | category | cases | |
|---|---|---|---|
| 1987 | 7 |
0.1%
|
|
| 1988 | 14 |
0.2%
|
|
| 1989 | 3 |
0%
|
|
| 1990 | 29 |
0.5%
|
|
| 1991 | 31 |
0.5%
|
|
| 1992 | 38 |
0.6%
|
|
| 1993 | 66 |
1.1%
|
|
| 1994 | 72 |
1.2%
|
|
| 1995 | 60 |
1%
|
|
| 1996 | 61 |
1%
|
|
| 1997 | 129 |
2.1%
|
|
| 1998 | 250 |
4.1%
|
|
| 1999 | 304 |
4.9%
|
|
| 2000 | 516 |
8.4%
|
|
| 2001 | 932 |
15.2%
|
|
| 2002 | 1663 |
27.1%
|
|
| 2003 | 1970 |
32.1%
|
|
| Sysmiss | 35375 |