| Value | Category | Cases | |
|---|---|---|---|
| 1996 | 2 |
0.5%
|
|
| 1997 | 2 |
0.5%
|
|
| 1998 | 6 |
1.6%
|
|
| 1999 | 15 |
3.9%
|
|
| 2000 | 19 |
4.9%
|
|
| 2001 | 19 |
4.9%
|
|
| 2002 | 38 |
9.9%
|
|
| 2003 | 50 |
13%
|
|
| 2004 | 66 |
17.2%
|
|
| 2005 | 90 |
23.4%
|
|
| 2006 | 74 |
19.3%
|
|
| 2007 | 3 |
0.8%
|
|
| Sysmiss | 538 |