| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
0.2%
|
|
| 1995 | 1 |
0.2%
|
|
| 1997 | 1 |
0.2%
|
|
| 2000 | 6 |
1%
|
|
| 2001 | 2 |
0.3%
|
|
| 2002 | 2 |
0.3%
|
|
| 2003 | 10 |
1.7%
|
|
| 2004 | 82 |
13.7%
|
|
| 2005 | 108 |
18%
|
|
| 2006 | 223 |
37.2%
|
|
| 2007 | 163 |
27.2%
|
|
| Sysmiss | 19084 |