| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 2 |
0%
|
|
| 1997 | 2 |
0%
|
|
| 1998 | 98 |
1.9%
|
|
| 1999 | 301 |
6%
|
|
| 2000 | 848 |
16.8%
|
|
| 2001 | 2062 |
40.8%
|
|
| 2002 | 1314 |
26%
|
|
| 2003 | 423 |
8.4%
|
|
| Sysmiss | 156594 |