| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.1%
|
|
| 1984 | 2 |
0.1%
|
|
| 1986 | 2 |
0.1%
|
|
| 1987 | 1 |
0.1%
|
|
| 1988 | 1 |
0.1%
|
|
| 1990 | 6 |
0.3%
|
|
| 1992 | 5 |
0.3%
|
|
| 1993 | 1 |
0.1%
|
|
| 1994 | 2 |
0.1%
|
|
| 1995 | 4 |
0.2%
|
|
| 1996 | 5 |
0.3%
|
|
| 1997 | 3 |
0.2%
|
|
| 1998 | 3 |
0.2%
|
|
| 1999 | 9 |
0.5%
|
|
| 2000 | 20 |
1.1%
|
|
| 2001 | 14 |
0.7%
|
|
| 2002 | 9 |
0.5%
|
|
| 2003 | 18 |
0.9%
|
|
| 2004 | 14 |
0.7%
|
|
| 2005 | 37 |
1.9%
|
|
| 2006 | 21 |
1.1%
|
|
| 2007 | 32 |
1.7%
|
|
| 2008 | 39 |
2%
|
|
| 2009 | 47 |
2.5%
|
|
| 2010 | 100 |
5.3%
|
|
| 2011 | 115 |
6%
|
|
| 2012 | 160 |
8.4%
|
|
| 2013 | 293 |
15.4%
|
|
| 2014 | 538 |
28.3%
|
|
| 2015 | 350 |
18.4%
|
|
| 2016 | 15 |
0.8%
|
|
| 9998 | don't remember | 37 |
1.9%
|
| Sysmiss | 36814 |