| Value | Category |
|---|---|
| 0 | |
| 1 | Less than an agricultural season |
| 2 | At least 1 agric season but less than an agric year |
| 3 | At least 1 agric year but less than 2 agric years |
| 4 | At least 2 agric years but less than 5 agric years |
| 5 | At least 5 agric years but less than 12 agric years |
| 6 | 12 years or more |
| 7 | |
| 8 | |
| 9 | |
| Sysmiss |