| Value | Category | Cases | |
|---|---|---|---|
| 1968 | 1 |
2.8%
|
|
| 1978 | 3 |
8.3%
|
|
| 1979 | 1 |
2.8%
|
|
| 1983 | 1 |
2.8%
|
|
| 1988 | 1 |
2.8%
|
|
| 1990 | 2 |
5.6%
|
|
| 1991 | 1 |
2.8%
|
|
| 1992 | 4 |
11.1%
|
|
| 1993 | 1 |
2.8%
|
|
| 1994 | 2 |
5.6%
|
|
| 1995 | 1 |
2.8%
|
|
| 1999 | 2 |
5.6%
|
|
| 2002 | 3 |
8.3%
|
|
| 2003 | 1 |
2.8%
|
|
| 2007 | 1 |
2.8%
|
|
| 2010 | 4 |
11.1%
|
|
| 2011 | 3 |
8.3%
|
|
| 2015 | 4 |
11.1%
|
|
| Sysmiss | 24559 |