| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 |
0.1%
|
|
| 1989 | 2 |
0.2%
|
|
| 1990 | 10 |
1.2%
|
|
| 1991 | 14 |
1.7%
|
|
| 1992 | 14 |
1.7%
|
|
| 1993 | 30 |
3.6%
|
|
| 1994 | 54 |
6.4%
|
|
| 1995 | 64 |
7.6%
|
|
| 1996 | 117 |
13.9%
|
|
| 1997 | 139 |
16.5%
|
|
| 1998 | 154 |
18.3%
|
|
| 1999 | 163 |
19.4%
|
|
| 2000 | 76 |
9%
|
|
| 9993 | inconsistent | 0 |
0%
|
| 9998 | don't know | 2 |
0.2%
|
| 9999 | not applicable | 0 |
0%
|
| 9999995 | missing:impute | 0 |
0%
|
| Sysmiss | 2777 |