| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
3.1%
|
|
| 2000 | 1 |
3.1%
|
|
| 2001 | 4 |
12.5%
|
|
| 2002 | 4 |
12.5%
|
|
| 2003 | 7 |
21.9%
|
|
| 2004 | 8 |
25%
|
|
| 2005 | 4 |
12.5%
|
|
| 2006 | 2 |
6.3%
|
|
| 2007 | 1 |
3.1%
|
|
| Sysmiss | 890 |