| value | category | cases | |
|---|---|---|---|
| 1990 | 1 |
0.1%
|
|
| 1991 | 4 |
0.2%
|
|
| 1993 | 4 |
0.2%
|
|
| 1994 | 2 |
0.1%
|
|
| 1995 | 2 |
0.1%
|
|
| 1996 | 3 |
0.2%
|
|
| 1997 | 2 |
0.1%
|
|
| 1998 | 8 |
0.5%
|
|
| 1999 | 38 |
2.2%
|
|
| 2000 | 95 |
5.6%
|
|
| 2001 | 246 |
14.4%
|
|
| 2002 | 543 |
31.9%
|
|
| 2003 | 755 |
44.3%
|
|
| Sysmiss | 8942 |