| Value | Category | Cases | |
|---|---|---|---|
| 1964 | 1 |
0.4%
|
|
| 1966 | 1 |
0.4%
|
|
| 1968 | 1 |
0.4%
|
|
| 1970 | 2 |
0.8%
|
|
| 1973 | 1 |
0.4%
|
|
| 1975 | 2 |
0.8%
|
|
| 1976 | 3 |
1.2%
|
|
| 1977 | 1 |
0.4%
|
|
| 1978 | 1 |
0.4%
|
|
| 1979 | 2 |
0.8%
|
|
| 1980 | 5 |
2%
|
|
| 1982 | 2 |
0.8%
|
|
| 1985 | 3 |
1.2%
|
|
| 1987 | 3 |
1.2%
|
|
| 1988 | 3 |
1.2%
|
|
| 1989 | 2 |
0.8%
|
|
| 1990 | 3 |
1.2%
|
|
| 1991 | 1 |
0.4%
|
|
| 1992 | 2 |
0.8%
|
|
| 1993 | 1 |
0.4%
|
|
| 1995 | 4 |
1.6%
|
|
| 1996 | 3 |
1.2%
|
|
| 1997 | 4 |
1.6%
|
|
| 1998 | 6 |
2.4%
|
|
| 1999 | 7 |
2.8%
|
|
| 2000 | 11 |
4.5%
|
|
| 2001 | 1 |
0.4%
|
|
| 2002 | 2 |
0.8%
|
|
| 2003 | 6 |
2.4%
|
|
| 2004 | 2 |
0.8%
|
|
| 2005 | 1 |
0.4%
|
|
| 2006 | 1 |
0.4%
|
|
| 2007 | 3 |
1.2%
|
|
| 2008 | 9 |
3.6%
|
|
| 2009 | 2 |
0.8%
|
|
| 2010 | 13 |
5.3%
|
|
| 2011 | 5 |
2%
|
|
| 2012 | 9 |
3.6%
|
|
| 2013 | 12 |
4.9%
|
|
| 2014 | 13 |
5.3%
|
|
| 2015 | 15 |
6.1%
|
|
| 2016 | 36 |
14.6%
|
|
| 2017 | 42 |
17%
|
|
| Sysmiss | 5111 |