| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1987 | 1 | 720 |
0.1%
|
|
| 1990 | 1 | 437 |
0.1%
|
|
| 1992 | 6 | 1060 |
0.2%
|
|
| 1993 | 3 | 1301 |
0.2%
|
|
| 1994 | 1 | 676 |
0.1%
|
|
| 1995 | 15 | 5923 |
1.1%
|
|
| 1996 | 29 | 10986 |
2.1%
|
|
| 1997 | 64 | 27341 |
5.2%
|
|
| 1998 | 936 | 351361 |
66.4%
|
|
| 1999 | 358 | 129491 |
24.5%
|
|
| Sysmiss | 1289 | 488523 |