| Value | Category | Cases | |
|---|---|---|---|
| 1973 | 1 |
4%
|
|
| 1978 | 1 |
4%
|
|
| 1979 | 1 |
4%
|
|
| 1985 | 1 |
4%
|
|
| 1986 | 2 |
8%
|
|
| 1987 | 1 |
4%
|
|
| 1991 | 1 |
4%
|
|
| 1995 | 3 |
12%
|
|
| 1997 | 1 |
4%
|
|
| 1998 | 2 |
8%
|
|
| 2000 | 1 |
4%
|
|
| 2001 | 2 |
8%
|
|
| 2004 | 1 |
4%
|
|
| 2005 | 2 |
8%
|
|
| 2007 | 3 |
12%
|
|
| 2008 | 2 |
8%
|
|
| Sysmiss | 1407 |