| Value | Category | Cases | |
|---|---|---|---|
| 1 | Annually | 23 |
6.4%
|
| 2 | Bi-annually | 2 |
0.6%
|
| 3 | Frequency | 53 |
14.7%
|
| 4 | Monthly | 2 |
0.6%
|
| Missing value | 280 |
77.8%
|