| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 14 |
1.4%
|
|
| 1990 | 94 |
9.4%
|
|
| 1991 | 102 |
10.2%
|
|
| 1992 | 108 |
10.8%
|
|
| 1993 | 144 |
14.4%
|
|
| 1994 | 109 |
10.9%
|
|
| 1995 | 126 |
12.6%
|
|
| 1996 | 106 |
10.6%
|
|
| 1997 | 114 |
11.4%
|
|
| 1998 | 82 |
8.2%
|