| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1989 | 2338 |
9.5%
|
| 1990 | 1990 | 18512 |
75.4%
|
| 1991 | 1991 | 3708 |
15.1%
|
| 1992 | 1992 | 0 |
0%
|
| 1993 | 1993 | 0 |
0%
|
| 1994 | 1994 | 0 |
0%
|
| -5 | Missing; Unknown; Inappropiate | 0 | |
| -4 | Not asked | 0 | |
| -3 | Not applicable | 0 | |
| -2 | No answer | 0 | |
| -1 | Don't know | 0 |