| Value | Category | Cases | |
|---|---|---|---|
| 1 | One season | 0 |
0%
|
| 2 | One year | 0 |
0%
|
| 3 | Two years | 0 |
0%
|
| 4 | Three years | 0 |
0%
|
| 5 | More than three years | 5 |
23.8%
|
| 6 | Unspecified | 16 |
76.2%
|
| Sysmiss | 904 |