| Value | Category | Cases | |
|---|---|---|---|
| 1997 | 26 |
0.4%
|
|
| 1998 | 21 |
0.3%
|
|
| 1999 | 21 |
0.3%
|
|
| 2001 | 26 |
0.4%
|
|
| 2004 | 26 |
0.4%
|
|
| 2005 | 21 |
0.3%
|
|
| 2006 | 26 |
0.4%
|
|
| 2007 | 3056 |
48%
|
|
| 2008 | 68 |
1.1%
|
|
| 2009 | 272 |
4.3%
|
|
| 2010 | 89 |
1.4%
|
|
| 2011 | 94 |
1.5%
|
|
| 2012 | 742 |
11.7%
|
|
| 2013 | 1745 |
27.4%
|
|
| 2014 | 136 |
2.1%
|
|
| Sysmiss | 2923 |