| Value |
Category |
| -5 |
Missing; Unknown |
| -4 |
Not asked |
| -3 |
Not applicable |
| -2 |
No answer |
| -1 |
Dont know |
| 1 |
1981-83 |
| 2 |
1989-91 |
| 3 |
1995-97 |
| 4 |
1999-2001 |
| 5 |
2005-2007 |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.