| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 32 |
7.7%
|
|
| 2004 | 162 |
38.9%
|
|
| 2005 | 1 |
0.2%
|
|
| 2006 | 2 |
0.5%
|
|
| 2007 | 3 |
0.7%
|
|
| 2008 | 1 |
0.2%
|
|
| 2009 | 4 |
1%
|
|
| 2011 | 1 |
0.2%
|
|
| 2012 | 1 |
0.2%
|
|
| Missing value | 209 |
50.2%
|