| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 1 |
1.4%
|
|
| 1994 | 1 |
1.4%
|
|
| 1998 | 1 |
1.4%
|
|
| 2002 | 1 |
1.4%
|
|
| 2003 | 1 |
1.4%
|
|
| 2004 | 4 |
5.7%
|
|
| 2005 | 2 |
2.9%
|
|
| 2006 | 4 |
5.7%
|
|
| 2008 | 6 |
8.6%
|
|
| 2009 | 3 |
4.3%
|
|
| 2010 | 4 |
5.7%
|
|
| 2011 | 6 |
8.6%
|
|
| 2012 | 8 |
11.4%
|
|
| 2013 | 8 |
11.4%
|
|
| 2014 | 14 |
20%
|
|
| 2015 | 4 |
5.7%
|
|
| 2016 | 1 |
1.4%
|
|
| 9998 | don't know | 1 |
1.4%
|
| Sysmiss | 38648 |