| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 1 |
0.2%
|
|
| 1964 | 1 |
0.2%
|
|
| 1965 | 1 |
0.2%
|
|
| 1966 | 1 |
0.2%
|
|
| 1967 | 1 |
0.2%
|
|
| 1968 | 2 |
0.4%
|
|
| 1969 | 2 |
0.4%
|
|
| 1970 | 2 |
0.4%
|
|
| 1973 | 1 |
0.2%
|
|
| 1974 | 1 |
0.2%
|
|
| 1975 | 3 |
0.6%
|
|
| 1976 | 1 |
0.2%
|
|
| 1977 | 2 |
0.4%
|
|
| 1980 | 2 |
0.4%
|
|
| 1982 | 1 |
0.2%
|
|
| 1983 | 3 |
0.6%
|
|
| 1984 | 6 |
1.2%
|
|
| 1985 | 4 |
0.8%
|
|
| 1986 | 6 |
1.2%
|
|
| 1988 | 9 |
1.8%
|
|
| 1989 | 5 |
1%
|
|
| 1990 | 2 |
0.4%
|
|
| 1991 | 6 |
1.2%
|
|
| 1992 | 7 |
1.4%
|
|
| 1993 | 3 |
0.6%
|
|
| 1994 | 2 |
0.4%
|
|
| 1995 | 6 |
1.2%
|
|
| 1996 | 6 |
1.2%
|
|
| 1997 | 7 |
1.4%
|
|
| 1998 | 5 |
1%
|
|
| 1999 | 2 |
0.4%
|
|
| 2000 | 12 |
2.4%
|
|
| 2001 | 5 |
1%
|
|
| 2002 | 5 |
1%
|
|
| 2003 | 1 |
0.2%
|
|
| 2004 | 9 |
1.8%
|
|
| 2005 | 10 |
2%
|
|
| 2006 | 20 |
4%
|
|
| 2007 | 19 |
3.8%
|
|
| 2008 | 22 |
4.4%
|
|
| 2009 | 37 |
7.4%
|
|
| 2010 | 50 |
10%
|
|
| 2011 | 51 |
10.2%
|
|
| 2012 | 55 |
11%
|
|
| 2013 | 53 |
10.6%
|
|
| 2014 | 30 |
6%
|
|
| 2015 | 2 |
0.4%
|
|
| 9999 | DON'T KNOW | 17 |
3.4%
|
| Sysmiss | 4243 |