| قيمة | فئة | حالات | |
|---|---|---|---|
| 1 | 1920-1979 | 35 |
13.3%
|
| 2 | (1980-1989) | 49 |
18.6%
|
| 3 | 1990- فما فوق | 179 |
67.8%
|
| 1918 | 1 |
0.4%
|