| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 1996 | 5 |
1%
|
|
| 1997 | 5 |
1%
|
|
| 1998 | 5 |
1%
|
|
| 1999 | 16 |
3.2%
|
|
| 2000 | 17 |
3.4%
|
|
| 2001 | 33 |
6.7%
|
|
| 2002 | 45 |
9.1%
|
|
| 2003 | 62 |
12.5%
|
|
| 2004 | 95 |
19.2%
|
|
| 2005 | 120 |
24.2%
|
|
| 2006 | 88 |
17.8%
|
|
| 2007 | 3 |
0.6%
|
|
| Sysmiss | 427 |