| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.7%
|
|
| 2000 | 1 |
0.7%
|
|
| 2003 | 2 |
1.5%
|
|
| 2004 | 5 |
3.7%
|
|
| 2005 | 12 |
8.8%
|
|
| 2006 | 32 |
23.5%
|
|
| 2007 | 35 |
25.7%
|
|
| 2008 | 46 |
33.8%
|
|
| 2009 | 1 |
0.7%
|
|
| 9999 | 1 |
0.7%
|
|
| Sysmiss | 310 |