| Value |
Category |
| -99 |
Don't know |
| -96 |
Other |
| -95 |
|
| -90 |
Not specified by interviewer |
| 1 |
Day |
| 2 |
Trip |
| 3 |
Barrel/gallon |
| 4 |
Week |
| 5 |
Month |
| 6 |
Year |
| 14 |
Jug |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.