| Value | Category | Cases | |
|---|---|---|---|
| 1 | Bi-annually (twice a year) | 1 |
0.2%
|
| 2 | Irregularly | 1 |
0.2%
|
| 3 | Monthly (Once every month) | 2 |
0.3%
|
| Missing value | 645 |
99.4%
|