| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 |
0.5%
|
|
| 1990 | 1 |
0.5%
|
|
| 1991 | 1 |
0.5%
|
|
| 1999 | 3 |
1.6%
|
|
| 2000 | 1 |
0.5%
|
|
| 2001 | 1 |
0.5%
|
|
| 2002 | 1 |
0.5%
|
|
| 2003 | 1 |
0.5%
|
|
| 2004 | 1 |
0.5%
|
|
| 2005 | 2 |
1.1%
|
|
| 2006 | 4 |
2.2%
|
|
| 2007 | 7 |
3.8%
|
|
| 2008 | 6 |
3.2%
|
|
| 2009 | 7 |
3.8%
|
|
| 2010 | 19 |
10.2%
|
|
| 2011 | 18 |
9.7%
|
|
| 2012 | 21 |
11.3%
|
|
| 2013 | 45 |
24.2%
|
|
| 2014 | 30 |
16.1%
|
|
| 2015 | 16 |
8.6%
|
|
| Sysmiss | 14 |