| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 1996 | 4 |
0.9%
|
|
| 1997 | 4 |
0.9%
|
|
| 1998 | 5 |
1.1%
|
|
| 1999 | 15 |
3.2%
|
|
| 2000 | 17 |
3.6%
|
|
| 2001 | 31 |
6.7%
|
|
| 2002 | 38 |
8.2%
|
|
| 2003 | 59 |
12.7%
|
|
| 2004 | 93 |
20%
|
|
| 2005 | 115 |
24.7%
|
|
| 2006 | 81 |
17.4%
|
|
| 2007 | 3 |
0.6%
|
|
| Sysmiss | 456 |