| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
0.6%
|
|
| 2002 | 2 |
1.2%
|
|
| 2003 | 7 |
4.2%
|
|
| 2004 | 61 |
36.5%
|
|
| 2005 | 68 |
40.7%
|
|
| 2006 | 28 |
16.8%
|
|
| Sysmiss | 98 |