| value | category | cases | |
|---|---|---|---|
| 1987 | 2 |
0.1%
|
|
| 1988 | 4 |
0.2%
|
|
| 1989 | 1 |
0.1%
|
|
| 1990 | 8 |
0.4%
|
|
| 1991 | 5 |
0.3%
|
|
| 1992 | 9 |
0.5%
|
|
| 1993 | 14 |
0.8%
|
|
| 1994 | 13 |
0.7%
|
|
| 1995 | 13 |
0.7%
|
|
| 1996 | 19 |
1%
|
|
| 1997 | 40 |
2.1%
|
|
| 1998 | 73 |
3.9%
|
|
| 1999 | 86 |
4.6%
|
|
| 2000 | 174 |
9.3%
|
|
| 2001 | 276 |
14.8%
|
|
| 2002 | 520 |
27.9%
|
|
| 2003 | 605 |
32.5%
|
|
| Sysmiss | 10615 |