| Value | Category |
|---|---|
| 1 | Go up more than in the last 12 months |
| 2 | Go up at the same rate as in the last 12 months |
| 3 | Go up less than in the last 12 months |
| 4 | Stayed about the same |
| 5 | Go down |
| z | Not applicable |
| a | Don't know |
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