| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
8.3%
|
|
| 1993 | 2 |
16.7%
|
|
| 1994 | 1 |
8.3%
|
|
| 1998 | 1 |
8.3%
|
|
| 2001 | 1 |
8.3%
|
|
| 2007 | 1 |
8.3%
|
|
| 2008 | 1 |
8.3%
|
|
| 2010 | 3 |
25%
|
|
| 2011 | 1 |
8.3%
|
|
| Sysmiss | 2838 |