| Value | Category | Cases | |
|---|---|---|---|
| 1 | Per-hour | 1971 |
12.7%
|
| 2 | Per-day | 3602 |
23.1%
|
| 3 | Per-acre | 4077 |
26.2%
|
| 4 | 2 |
0%
|
|
| 9 | Other | 5908 |
38%
|
| Sysmiss | 46414 |