| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 2 |
8%
|
|
| 1998 | 2 |
8%
|
|
| 1999 | 3 |
12%
|
|
| 2000 | 9 |
36%
|
|
| 2001 | 7 |
28%
|
|
| 2002 | 2 |
8%
|
|
| Sysmiss | 8024 |