Value |
Category |
1 |
never |
2 |
before 1970 |
3 |
1970-74 |
4 |
1975-79 |
5 |
1980-84 |
6 |
1985-89 |
7 |
since 1990 |
Sysmiss |
|
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.