| Value | Category | Cases | |
|---|---|---|---|
| 1 | One season | 0 |
0%
|
| 2 | One year | 0 |
0%
|
| 3 | Two years | 0 |
0%
|
| 4 | Three years | 1 |
1.2%
|
| 5 | More than three years | 6 |
7.1%
|
| 6 | Unspecified | 77 |
90.6%
|
| r | 1 |
1.2%
|
|
| Sysmiss | 840 |