| Value |
Category |
| 1 |
Built before 1900 |
| 2 |
Built 1900-1919 |
| 3 |
Built 1920-1939 |
| 4 |
Built 1940-1949 |
| 5 |
Built 1950-1959 |
| 6 |
Built since 1960 |
| 7 |
Unspecified |
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.