| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
10%
|
|
| 1994 | 1 |
10%
|
|
| 1996 | 2 |
20%
|
|
| 1997 | 1 |
10%
|
|
| 1998 | 2 |
20%
|
|
| 2000 | 2 |
20%
|
|
| 2003 | 1 |
10%
|
|
| Sysmiss | 8015 |