| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 13 |
1.2%
|
|
| 2000 | 29 |
2.7%
|
|
| 2001 | 18 |
1.7%
|
|
| 2002 | 19 |
1.8%
|
|
| 2003 | 24 |
2.2%
|
|
| 2004 | 27 |
2.5%
|
|
| 2005 | 26 |
2.4%
|
|
| 2006 | 45 |
4.2%
|
|
| 2007 | 58 |
5.4%
|
|
| 2008 | 93 |
8.7%
|
|
| 2009 | 54 |
5.1%
|
|
| 2010 | 93 |
8.7%
|
|
| 2011 | 66 |
6.2%
|
|
| 2012 | 121 |
11.3%
|
|
| 2013 | 197 |
18.5%
|
|
| 2014 | 50 |
4.7%
|
|
| 2015 | 1 |
0.1%
|
|
| 9999 | Missing | 133 |
12.5%
|
| Sysmiss | 1 |