| Value | Category | Cases | |
|---|---|---|---|
| 1955 | 1 |
0.4%
|
|
| 1956 | 1 |
0.4%
|
|
| 1961 | 1 |
0.4%
|
|
| 1974 | 1 |
0.4%
|
|
| 1975 | 2 |
0.7%
|
|
| 1977 | 3 |
1.1%
|
|
| 1979 | 2 |
0.7%
|
|
| 1980 | 1 |
0.4%
|
|
| 1982 | 4 |
1.4%
|
|
| 1983 | 3 |
1.1%
|
|
| 1985 | 1 |
0.4%
|
|
| 1986 | 3 |
1.1%
|
|
| 1987 | 2 |
0.7%
|
|
| 1988 | 1 |
0.4%
|
|
| 1989 | 2 |
0.7%
|
|
| 1990 | 2 |
0.7%
|
|
| 1991 | 2 |
0.7%
|
|
| 1992 | 2 |
0.7%
|
|
| 1993 | 2 |
0.7%
|
|
| 1994 | 4 |
1.4%
|
|
| 1995 | 2 |
0.7%
|
|
| 1996 | 3 |
1.1%
|
|
| 1997 | 7 |
2.5%
|
|
| 1998 | 9 |
3.2%
|
|
| 1999 | 3 |
1.1%
|
|
| 2000 | 7 |
2.5%
|
|
| 2001 | 9 |
3.2%
|
|
| 2002 | 13 |
4.6%
|
|
| 2003 | 5 |
1.8%
|
|
| 2004 | 5 |
1.8%
|
|
| 2005 | 18 |
6.4%
|
|
| 2006 | 9 |
3.2%
|
|
| 2007 | 11 |
3.9%
|
|
| 2008 | 4 |
1.4%
|
|
| 2009 | 5 |
1.8%
|
|
| 2010 | 13 |
4.6%
|
|
| 2011 | 10 |
3.5%
|
|
| 2012 | 9 |
3.2%
|
|
| 2013 | 9 |
3.2%
|
|
| 2014 | 11 |
3.9%
|
|
| 2015 | 7 |
2.5%
|
|
| 2016 | 5 |
1.8%
|
|
| 2017 | 5 |
1.8%
|
|
| 3333 | Missing | 8 |
2.8%
|
| 5555 | Not Applicable | 0 |
0%
|
| 8888 | Refused | 2 |
0.7%
|
| 9999 | Don't know | 53 |
18.8%
|
| Sysmiss | 717 |