| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
1%
|
|
| 1999 | 1 |
1%
|
|
| 2002 | 5 |
5.2%
|
|
| 2003 | 4 |
4.2%
|
|
| 2004 | 5 |
5.2%
|
|
| 2005 | 11 |
11.5%
|
|
| 2006 | 37 |
38.5%
|
|
| 2007 | 26 |
27.1%
|
|
| 2008 | 6 |
6.3%
|
|
| Sysmiss | 149 |