| Value | Category | Cases | |
|---|---|---|---|
| 1 | Until the 1960s | 274 |
2.7%
|
| 2 | In 1960-1969 | 870 |
8.7%
|
| 3 | In 1970-1979 | 1971 |
19.8%
|
| 4 | In 1980-1991 | 3329 |
33.4%
|
| 5 | In 1992-1999 | 1564 |
15.7%
|
| 6 | In 2000-2009 | 1364 |
13.7%
|
| 7 | In 2010 and later | 555 |
5.6%
|
| 9 | Does not know, it is difficult to answer | 52 |
0.5%
|