| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.4%
|
|
| 1996 | 1 |
0.4%
|
|
| 1998 | 3 |
1.3%
|
|
| 1999 | 8 |
3.3%
|
|
| 2000 | 6 |
2.5%
|
|
| 2001 | 7 |
2.9%
|
|
| 2002 | 27 |
11.3%
|
|
| 2003 | 36 |
15.1%
|
|
| 2004 | 36 |
15.1%
|
|
| 2005 | 62 |
25.9%
|
|
| 2006 | 49 |
20.5%
|
|
| 2007 | 3 |
1.3%
|
|
| Sysmiss | 683 |