| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 |
0%
|
|
| 1995 | 67 |
1.9%
|
|
| 1996 | 484 |
14%
|
|
| 1997 | 587 |
17%
|
|
| 1998 | 714 |
20.7%
|
|
| 1999 | 933 |
27%
|
|
| 2000 | 669 |
19.4%
|
|
| 9997 | Missing | 0 |
0%
|
| Sysmiss | 3811 |