| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
0.6%
|
|
| 2002 | 2 |
1.3%
|
|
| 2003 | 6 |
3.8%
|
|
| 2004 | 54 |
33.8%
|
|
| 2005 | 68 |
42.5%
|
|
| 2006 | 29 |
18.1%
|
|
| Sysmiss | 105 |