| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 1 |
0.6%
|
|
| 2002 | 2 |
1.2%
|
|
| 2003 | 3 |
1.7%
|
|
| 2004 | 7 |
4.1%
|
|
| 2005 | 5 |
2.9%
|
|
| 2006 | 12 |
7%
|
|
| 2007 | 4 |
2.3%
|
|
| 2008 | 6 |
3.5%
|
|
| 2009 | 17 |
9.9%
|
|
| 2010 | 20 |
11.6%
|
|
| 2011 | 20 |
11.6%
|
|
| 2012 | 39 |
22.7%
|
|
| 2013 | 35 |
20.3%
|
|
| 9999 | 99. Missing | 1 |
0.6%
|
| Sysmiss | 138 |