| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0%
|
|
| 1993 | 1 |
0%
|
|
| 1997 | 3 |
0.1%
|
|
| 1998 | 80 |
3.2%
|
|
| 1999 | 153 |
6.1%
|
|
| 2000 | 343 |
13.6%
|
|
| 2001 | 578 |
22.9%
|
|
| 2002 | 806 |
31.9%
|
|
| 2003 | 559 |
22.1%
|
|
| Sysmiss | 159120 |