| value | category | cases | |
|---|---|---|---|
| 1988 | 1 |
0.3%
|
|
| 1990 | 1 |
0.3%
|
|
| 1991 | 3 |
0.9%
|
|
| 1992 | 2 |
0.6%
|
|
| 1993 | 1 |
0.3%
|
|
| 1994 | 2 |
0.6%
|
|
| 1995 | 3 |
0.9%
|
|
| 1996 | 3 |
0.9%
|
|
| 1997 | 3 |
0.9%
|
|
| 1998 | 8 |
2.3%
|
|
| 1999 | 19 |
5.4%
|
|
| 2000 | 33 |
9.4%
|
|
| 2001 | 49 |
13.9%
|
|
| 2002 | 105 |
29.8%
|
|
| 2003 | 119 |
33.8%
|
|
| Sysmiss | 1988 |