| Value | Category | Cases | |
|---|---|---|---|
| 1986 | 509 |
5.2%
|
|
| 1987 | 637 |
6.5%
|
|
| 1988 | 639 |
6.5%
|
|
| 1989 | 584 |
5.9%
|
|
| 1990 | 714 |
7.2%
|
|
| 1991 | 613 |
6.2%
|
|
| 1992 | 664 |
6.7%
|
|
| 1993 | 726 |
7.4%
|
|
| 1994 | 672 |
6.8%
|
|
| 1995 | 750 |
7.6%
|
|
| 1996 | 711 |
7.2%
|
|
| 1997 | 737 |
7.5%
|
|
| 1998 | 692 |
7%
|
|
| 1999 | 608 |
6.2%
|
|
| 2000 | 604 |
6.1%
|