| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 |
0.1%
|
|
| 1986 | 1 |
0.1%
|
|
| 1988 | 1 |
0.1%
|
|
| 1990 | 3 |
0.2%
|
|
| 1992 | 1 |
0.1%
|
|
| 1993 | 29 |
1.6%
|
|
| 1994 | 504 |
27%
|
|
| 1995 | 653 |
35%
|
|
| 1996 | 565 |
30.3%
|
|
| 1997 | 107 |
5.7%
|
|
| Sysmiss | 62 |