| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 8327 |
8.3%
|
|
| 1989 | 8327 |
8.3%
|
|
| 1990 | 8327 |
8.3%
|
|
| 1991 | 8327 |
8.3%
|
|
| 1992 | 13429 |
13.4%
|
|
| 1993 | 13429 |
13.4%
|
|
| 1994 | 13429 |
13.4%
|
|
| 1995 | 13429 |
13.4%
|
|
| 1996 | 13429 |
13.4%
|