| Value | Category | Cases | |
|---|---|---|---|
| 1963 | 1 |
0.1%
|
|
| 1969 | 1 |
0.1%
|
|
| 1970 | 1 |
0.1%
|
|
| 1971 | 1 |
0.1%
|
|
| 1973 | 1 |
0.1%
|
|
| 1974 | 1 |
0.1%
|
|
| 1975 | 1 |
0.1%
|
|
| 1977 | 1 |
0.1%
|
|
| 1979 | 1 |
0.1%
|
|
| 1980 | 2 |
0.3%
|
|
| 1981 | 2 |
0.3%
|
|
| 1983 | 3 |
0.4%
|
|
| 1984 | 2 |
0.3%
|
|
| 1985 | 1 |
0.1%
|
|
| 1987 | 3 |
0.4%
|
|
| 1988 | 2 |
0.3%
|
|
| 1989 | 2 |
0.3%
|
|
| 1991 | 1 |
0.1%
|
|
| 1992 | 4 |
0.5%
|
|
| 1993 | 2 |
0.3%
|
|
| 1994 | 4 |
0.5%
|
|
| 1995 | 4 |
0.5%
|
|
| 1996 | 4 |
0.5%
|
|
| 1997 | 8 |
1%
|
|
| 1998 | 9 |
1.2%
|
|
| 1999 | 7 |
0.9%
|
|
| 2000 | 10 |
1.3%
|
|
| 2001 | 6 |
0.8%
|
|
| 2002 | 14 |
1.8%
|
|
| 2003 | 9 |
1.2%
|
|
| 2004 | 9 |
1.2%
|
|
| 2005 | 9 |
1.2%
|
|
| 2006 | 21 |
2.7%
|
|
| 2007 | 28 |
3.6%
|
|
| 2008 | 51 |
6.5%
|
|
| 2009 | 133 |
17.1%
|
|
| 2010 | 67 |
8.6%
|
|
| 2011 | 3 |
0.4%
|
|
| 3333 | Missing | 40 |
5.1%
|
| 5555 | Not applicable | 0 |
0%
|
| 8888 | Refused | 2 |
0.3%
|
| 9999 | Don't know | 309 |
39.6%
|
| Sysmiss | 344 |