| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
1.3%
|
|
| 1979 | 2 |
2.7%
|
|
| 1989 | 1 |
1.3%
|
|
| 1994 | 2 |
2.7%
|
|
| 2001 | 1 |
1.3%
|
|
| 2002 | 1 |
1.3%
|
|
| 2004 | 1 |
1.3%
|
|
| 2005 | 3 |
4%
|
|
| 2006 | 1 |
1.3%
|
|
| 2007 | 1 |
1.3%
|
|
| 2008 | 4 |
5.3%
|
|
| 2009 | 3 |
4%
|
|
| 2010 | 1 |
1.3%
|
|
| 2012 | 3 |
4%
|
|
| 2013 | 1 |
1.3%
|
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not Applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 49 |
65.3%
|
| Sysmiss | 30035 |