| Value | Category | Cases | |
|---|---|---|---|
| 1 | Until the 1960s | 307 |
3.1%
|
| 2 | In 1960-1969 | 1048 |
10.5%
|
| 3 | In 1970-1979 | 1691 |
16.9%
|
| 4 | In 1980-1991 | 3001 |
30.1%
|
| 5 | In 1992-1999 | 1695 |
17%
|
| 6 | In 2000-2009 | 1361 |
13.6%
|
| 7 | In 2010 and later | 805 |
8.1%
|
| 9 | Does not know, it is difficult to answer | 74 |
0.7%
|