| Value | Category | Cases | |
|---|---|---|---|
| 1987 | 1 |
0.1%
|
|
| 1992 | 1 |
0.1%
|
|
| 1995 | 1 |
0.1%
|
|
| 1996 | 29 |
2.4%
|
|
| 1997 | 75 |
6.1%
|
|
| 1998 | 101 |
8.2%
|
|
| 1999 | 186 |
15.1%
|
|
| 2000 | 408 |
33.2%
|
|
| 2001 | 393 |
32%
|
|
| 9998 | NSP | 33 |
2.7%
|
| 9999 | 2 | ||
| Sysmiss | 2959 |