| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 1 |
3.2%
|
|
| 1986 | 2 |
6.5%
|
|
| 1987 | 1 |
3.2%
|
|
| 1988 | 1 |
3.2%
|
|
| 1992 | 1 |
3.2%
|
|
| 1993 | 1 |
3.2%
|
|
| 1994 | 1 |
3.2%
|
|
| 1996 | 1 |
3.2%
|
|
| 1998 | 1 |
3.2%
|
|
| 1999 | 3 |
9.7%
|
|
| 2001 | 1 |
3.2%
|
|
| 2005 | 2 |
6.5%
|
|
| 2006 | 3 |
9.7%
|
|
| 2008 | 1 |
3.2%
|
|
| 2010 | 3 |
9.7%
|
|
| 2013 | 6 |
19.4%
|
|
| 2014 | 1 |
3.2%
|
|
| 2015 | 1 |
3.2%
|
|
| Sysmiss | 119357 |