| Value | Category | Cases | |
|---|---|---|---|
| 1979 | 1 |
0.2%
|
|
| 1984 | 1 |
0.2%
|
|
| 1989 | 2 |
0.4%
|
|
| 1992 | 1 |
0.2%
|
|
| 1995 | 2 |
0.4%
|
|
| 1996 | 2 |
0.4%
|
|
| 1997 | 2 |
0.4%
|
|
| 1998 | 1 |
0.2%
|
|
| 1999 | 4 |
0.9%
|
|
| 2000 | 3 |
0.7%
|
|
| 2001 | 7 |
1.6%
|
|
| 2002 | 2 |
0.4%
|
|
| 2003 | 2 |
0.4%
|
|
| 2004 | 5 |
1.1%
|
|
| 2005 | 4 |
0.9%
|
|
| 2006 | 7 |
1.6%
|
|
| 2007 | 13 |
2.9%
|
|
| 2008 | 16 |
3.5%
|
|
| 2009 | 16 |
3.5%
|
|
| 2010 | 24 |
5.3%
|
|
| 2011 | 23 |
5.1%
|
|
| 2012 | 49 |
10.9%
|
|
| 2013 | 71 |
15.7%
|
|
| 2014 | 89 |
19.7%
|
|
| 2015 | 104 |
23.1%
|
|
| Sysmiss | 904 |