| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 1 |
5.3%
|
|
| 1997 | 1 |
5.3%
|
|
| 1999 | 10 |
52.6%
|
|
| 2000 | 7 |
36.8%
|
|
| Sysmiss | 12217 |