| Value | Category | Cases | |
|---|---|---|---|
| Every 2 years | 29 |
49.2%
|
|
| Every 3 years | 12 |
20.3%
|
|
| Every 4 years | 1 |
1.7%
|
|
| Every 5 years or more | 8 |
13.6%
|
|
| NA (no rule) | 4 |
6.8%
|
|
| Yearly | 5 |
8.5%
|