| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1 |
4.5%
|
|
| 1994 | 2 |
9.1%
|
|
| 1999 | 3 |
13.6%
|
|
| 2000 | 3 |
13.6%
|
|
| 2002 | 5 |
22.7%
|
|
| 2003 | 1 |
4.5%
|
|
| 2004 | 2 |
9.1%
|
|
| 2005 | 2 |
9.1%
|
|
| 2007 | 1 |
4.5%
|
|
| 2008 | 1 |
4.5%
|
|
| 2009 | 1 |
4.5%
|
|
| Sysmiss | 728 |