| Value | Category | 
|---|---|
| 2 | 1 | 
| 3 | 2 | 
| 4 | 3 | 
| 5 | 4 | 
| 6 | 5 | 
| 7 | 6 | 
| 8 | 7 | 
| 9 | 8 | 
| 10 | 10 | 
| 11 | 11 | 
| 12 | 12 | 
| 13 | 13 | 
| 14 | 14 | 
| 15 | 15 | 
| 16 | 16 | 
| 17 | 18 | 
| 18 | 20 | 
| 19 | 21 | 
| 20 | 23 | 
| 21 | 24 | 
| 22 | 25 | 
| 23 | 27 | 
| 24 | 28 | 
| 25 | 30 | 
| 26 | 35 | 
| 27 | 36 | 
| 28 | 38 | 
| 29 | 40 | 
| 30 | 42 | 
| 31 | 48 | 
| 32 | 49 | 
| 33 | 50 | 
| 34 | 54 | 
| 35 | 56 | 
| 36 | 60 | 
| 37 | 63 | 
| 38 | 70 | 
| 39 | 80 | 
| 40 | Don't know | 
| 41 | Refused to answer | 
| 42 | Outlier set to missing | 
| 43 | Inconsistency set to missing | 
| 44 | Not applicable |