| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 |
0.8%
|
|
| 1997 | 1 |
0.8%
|
|
| 1998 | 4 |
3.1%
|
|
| 2000 | 1 |
0.8%
|
|
| 2002 | 1 |
0.8%
|
|
| 2003 | 3 |
2.3%
|
|
| 2004 | 1 |
0.8%
|
|
| 2005 | 2 |
1.5%
|
|
| 2006 | 11 |
8.4%
|
|
| 2007 | 18 |
13.7%
|
|
| 2008 | 88 |
67.2%
|
|
| Sysmiss | 301 |