| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 1 |
1.8%
|
| 2003 | 1 |
1.8%
|
|
| 2005 | 2 |
3.6%
|
|
| 2006 | 5 |
9.1%
|
|
| 2007 | 3 |
5.5%
|
|
| 2008 | 2 |
3.6%
|
|
| 2009 | 14 |
25.5%
|
|
| 2010 | 9 |
16.4%
|
|
| 2011 | 10 |
18.2%
|
|
| 2012 | 7 |
12.7%
|
|
| 2013 | 1 |
1.8%
|
|
| Sysmiss | 1670 |