| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
2.7%
|
|
| 1999 | 1 |
2.7%
|
|
| 2000 | 11 |
29.7%
|
|
| 2001 | 7 |
18.9%
|
|
| 2002 | 2 |
5.4%
|
|
| 2006 | 11 |
29.7%
|
|
| 2008 | 3 |
8.1%
|
|
| 2009 | 1 |
2.7%
|
|
| Sysmiss | 187 |