| Value | Category | Cases | |
|---|---|---|---|
| 1972 | 1 |
4.5%
|
|
| 1978 | 1 |
4.5%
|
|
| 1979 | 1 |
4.5%
|
|
| 1983 | 1 |
4.5%
|
|
| 1986 | 1 |
4.5%
|
|
| 1993 | 1 |
4.5%
|
|
| 1995 | 1 |
4.5%
|
|
| 1996 | 1 |
4.5%
|
|
| 1997 | 1 |
4.5%
|
|
| 1999 | 2 |
9.1%
|
|
| 2001 | 1 |
4.5%
|
|
| 2004 | 2 |
9.1%
|
|
| 2011 | 1 |
4.5%
|
|
| 2012 | 1 |
4.5%
|
|
| 2013 | 1 |
4.5%
|
|
| 2014 | 1 |
4.5%
|
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not Applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 4 |
18.2%
|
| Sysmiss | 977 |