| Value | Category | Cases | |
|---|---|---|---|
| 1998 | 1 |
0.9%
|
|
| 1999 | 1 |
0.9%
|
|
| 2000 | 1 |
0.9%
|
|
| 2003 | 1 |
0.9%
|
|
| 2004 | 4 |
3.8%
|
|
| 2006 | 4 |
3.8%
|
|
| 2007 | 2 |
1.9%
|
|
| 2008 | 6 |
5.7%
|
|
| 2009 | 3 |
2.8%
|
|
| 2010 | 3 |
2.8%
|
|
| 2011 | 5 |
4.7%
|
|
| 2012 | 6 |
5.7%
|
|
| 2013 | 21 |
19.8%
|
|
| 2014 | 29 |
27.4%
|
|
| 2015 | 18 |
17%
|
|
| 9998 | don't know | 1 |
0.9%
|
| Sysmiss | 11653 |