| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 1 |
0.8%
|
|
| 1998 | 2 |
1.6%
|
|
| 1999 | 1 |
0.8%
|
|
| 2000 | 8 |
6.3%
|
|
| 2001 | 1 |
0.8%
|
|
| 2002 | 8 |
6.3%
|
|
| 2003 | 22 |
17.2%
|
|
| 2004 | 24 |
18.8%
|
|
| 2005 | 61 |
47.7%
|
|
| Sysmiss | 167 |