| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 1 |
0.1%
|
|
| 2003 | 1 |
0.1%
|
|
| 2004 | 5 |
0.4%
|
|
| 2005 | 6 |
0.5%
|
|
| 2007 | 3 |
0.3%
|
|
| 2008 | 5 |
0.4%
|
|
| 2009 | 3 |
0.3%
|
|
| 2010 | 2 |
0.2%
|
|
| 2011 | 3 |
0.3%
|
|
| 2012 | 3 |
0.3%
|
|
| 2013 | 3 |
0.3%
|
|
| Sysmiss | 1153 |