| Value | Category | Cases | |
|---|---|---|---|
| 1960 | 1 |
0.7%
|
|
| 1976 | 2 |
1.4%
|
|
| 1978 | 2 |
1.4%
|
|
| 1979 | 1 |
0.7%
|
|
| 1981 | 1 |
0.7%
|
|
| 1982 | 1 |
0.7%
|
|
| 1983 | 1 |
0.7%
|
|
| 1987 | 1 |
0.7%
|
|
| 1989 | 1 |
0.7%
|
|
| 1990 | 2 |
1.4%
|
|
| 1992 | 1 |
0.7%
|
|
| 1996 | 1 |
0.7%
|
|
| 1997 | 1 |
0.7%
|
|
| 1998 | 1 |
0.7%
|
|
| 1999 | 1 |
0.7%
|
|
| 2000 | 1 |
0.7%
|
|
| 2001 | 1 |
0.7%
|
|
| 2002 | 3 |
2.1%
|
|
| 2003 | 2 |
1.4%
|
|
| 2004 | 3 |
2.1%
|
|
| 2005 | 1 |
0.7%
|
|
| 2006 | 3 |
2.1%
|
|
| 2007 | 3 |
2.1%
|
|
| 2008 | 3 |
2.1%
|
|
| 2009 | 4 |
2.9%
|
|
| 2010 | 2 |
1.4%
|
|
| 2011 | 1 |
0.7%
|
|
| 2012 | 3 |
2.1%
|
|
| 2013 | 1 |
0.7%
|
|
| 2014 | 1 |
0.7%
|
|
| 2015 | 3 |
2.1%
|
|
| 2016 | 2 |
1.4%
|
|
| 2017 | 1 |
0.7%
|
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not Applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 84 |
60%
|
| Sysmiss | 29970 |