| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
4.2%
|
|
| 1981 | 1 |
4.2%
|
|
| 1995 | 1 |
4.2%
|
|
| 2000 | 2 |
8.3%
|
|
| 2002 | 1 |
4.2%
|
|
| 2005 | 1 |
4.2%
|
|
| 2006 | 1 |
4.2%
|
|
| 2007 | 1 |
4.2%
|
|
| 2008 | 2 |
8.3%
|
|
| 2009 | 1 |
4.2%
|
|
| 2010 | 6 |
25%
|
|
| 2011 | 6 |
25%
|
|
| Sysmiss | 437 |