| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.2%
|
|
| 1981 | 1 |
0.2%
|
|
| 1986 | 3 |
0.6%
|
|
| 1987 | 1 |
0.2%
|
|
| 1988 | 2 |
0.4%
|
|
| 1989 | 1 |
0.2%
|
|
| 1990 | 2 |
0.4%
|
|
| 1993 | 5 |
1%
|
|
| 1994 | 1 |
0.2%
|
|
| 1995 | 1 |
0.2%
|
|
| 1996 | 1 |
0.2%
|
|
| 1997 | 2 |
0.4%
|
|
| 1998 | 5 |
1%
|
|
| 1999 | 6 |
1.2%
|
|
| 2000 | 6 |
1.2%
|
|
| 2001 | 6 |
1.2%
|
|
| 2002 | 3 |
0.6%
|
|
| 2003 | 12 |
2.4%
|
|
| 2004 | 6 |
1.2%
|
|
| 2005 | 15 |
3%
|
|
| 2006 | 12 |
2.4%
|
|
| 2007 | 15 |
3%
|
|
| 2008 | 26 |
5.3%
|
|
| 2009 | 34 |
6.9%
|
|
| 2010 | 48 |
9.7%
|
|
| 2011 | 53 |
10.7%
|
|
| 2012 | 70 |
14.1%
|
|
| 2013 | 124 |
25.1%
|
|
| 2014 | 1 |
0.2%
|
|
| 9998 | year don't know | 32 |
6.5%
|
| Sysmiss | 10421 |