| Value | Category | Cases | |
|---|---|---|---|
| 1 | Before 1980 | 42 |
1.9%
|
| 2 | 1980-1999 | 253 |
11.6%
|
| 3 | 200-2009 | 322 |
14.8%
|
| 4 | 2010-2014 | 285 |
13.1%
|
| 5 | 2015 or after | 596 |
27.3%
|
| 9999 | Unknown | 684 |
31.3%
|