| Value |
Category |
| 1 |
until 1946 |
| 2 |
1946 - 1960 |
| 3 |
1961 - 1980 |
| 4 |
1981 - 1995 |
| 5 |
1996 and later |
| 6 |
unknown |
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.