| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 1 |
0.7%
|
|
| 1962 | 1 |
0.7%
|
|
| 1963 | 1 |
0.7%
|
|
| 1971 | 1 |
0.7%
|
|
| 1975 | 1 |
0.7%
|
|
| 1978 | 1 |
0.7%
|
|
| 1981 | 1 |
0.7%
|
|
| 1983 | 1 |
0.7%
|
|
| 1984 | 1 |
0.7%
|
|
| 1985 | 1 |
0.7%
|
|
| 1989 | 1 |
0.7%
|
|
| 1990 | 1 |
0.7%
|
|
| 1994 | 3 |
2%
|
|
| 1995 | 1 |
0.7%
|
|
| 1996 | 1 |
0.7%
|
|
| 1997 | 2 |
1.3%
|
|
| 1999 | 1 |
0.7%
|
|
| 2002 | 5 |
3.3%
|
|
| 2003 | 1 |
0.7%
|
|
| 2004 | 5 |
3.3%
|
|
| 2005 | 1 |
0.7%
|
|
| 2006 | 1 |
0.7%
|
|
| 2007 | 4 |
2.6%
|
|
| 2008 | 2 |
1.3%
|
|
| 2009 | 3 |
2%
|
|
| 2010 | 4 |
2.6%
|
|
| 2011 | 2 |
1.3%
|
|
| 2012 | 7 |
4.6%
|
|
| 2013 | 6 |
3.9%
|
|
| 2014 | 9 |
5.9%
|
|
| 2015 | 13 |
8.5%
|
|
| 2016 | 9 |
5.9%
|
|
| 2017 | 1 |
0.7%
|
|
| 3333 | Missing | 1 |
0.7%
|
| 5555 | Not applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 59 |
38.6%
|
| Sysmiss | 846 |