| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 6981 |
33%
|
| 2 | Monthly | 6392 |
30.2%
|
| 3 | Yearly | 6062 |
28.6%
|
| 4 | Every 2-3 years | 1087 |
5.1%
|
| 5 | Every 3 years or more | 662 |
3.1%
|
| Sysmiss | 8877 |