| Value | Category | Cases | |
|---|---|---|---|
| 1 | more than a 100 years ago | 38 |
48.1%
|
| 2 | less than a 100 years but before independence | 17 |
21.5%
|
| 3 | after independence | 23 |
29.1%
|
| 9 | 1 |
1.3%
|
|
| Sysmiss | 89 |