| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 |
0.7%
|
|
| 1993 | 1 |
0.7%
|
|
| 1995 | 1 |
0.7%
|
|
| 1997 | 2 |
1.3%
|
|
| 1998 | 4 |
2.7%
|
|
| 2000 | 6 |
4%
|
|
| 2002 | 6 |
4%
|
|
| 2003 | 6 |
4%
|
|
| 2004 | 15 |
10.1%
|
|
| 2005 | 17 |
11.4%
|
|
| 2006 | 16 |
10.7%
|
|
| 2007 | 27 |
18.1%
|
|
| 2008 | 44 |
29.5%
|
|
| 9999 | 3 |
2%
|
|
| Sysmiss | 297 |