| Value | Category | Cases | |
|---|---|---|---|
| 1975 | 1 |
0.5%
|
|
| 1977 | 1 |
0.5%
|
|
| 1980 | 1 |
0.5%
|
|
| 1984 | 2 |
1.1%
|
|
| 1986 | 3 |
1.6%
|
|
| 1987 | 2 |
1.1%
|
|
| 1988 | 1 |
0.5%
|
|
| 1989 | 2 |
1.1%
|
|
| 1990 | 1 |
0.5%
|
|
| 1991 | 2 |
1.1%
|
|
| 1992 | 2 |
1.1%
|
|
| 1994 | 2 |
1.1%
|
|
| 1995 | 1 |
0.5%
|
|
| 1997 | 3 |
1.6%
|
|
| 1998 | 3 |
1.6%
|
|
| 1999 | 1 |
0.5%
|
|
| 2000 | 4 |
2.1%
|
|
| 2001 | 2 |
1.1%
|
|
| 2002 | 2 |
1.1%
|
|
| 2003 | 1 |
0.5%
|
|
| 2005 | 2 |
1.1%
|
|
| 2007 | 3 |
1.6%
|
|
| 2008 | 6 |
3.2%
|
|
| 2009 | 3 |
1.6%
|
|
| 2010 | 1 |
0.5%
|
|
| 2011 | 1 |
0.5%
|
|
| 2012 | 4 |
2.1%
|
|
| 2013 | 5 |
2.6%
|
|
| 2014 | 1 |
0.5%
|
|
| 2015 | 1 |
0.5%
|
|
| 2016 | 1 |
0.5%
|
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not Applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 125 |
65.8%
|
| Sysmiss | 29920 |