| Value | Category | Cases | |
|---|---|---|---|
| 1979 | 1 |
8.3%
|
|
| 1982 | 1 |
8.3%
|
|
| 1984 | 1 |
8.3%
|
|
| 1986 | 1 |
8.3%
|
|
| 1992 | 1 |
8.3%
|
|
| 1997 | 2 |
16.7%
|
|
| 1998 | 1 |
8.3%
|
|
| 1999 | 4 |
33.3%
|
|
| Sysmiss | 7961 |