| Value |
Category |
| 1 |
Before 1946 |
| 2 |
In years 1946 -1960 |
| 3 |
In years 1961 - 1980 |
| 4 |
In years 1981 - 1995 |
| 5 |
In years 1996 _ 2006 |
| 6 |
After 2006 |
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.