| Value | Category |
|---|---|
| -9 | Do not know |
| -8 | Refused |
| 0 | |
| 96 | Through shipment |
| 555 | More than 20 |
| 999 | N/A |
| 150000 | |
| 1000000 | |
| 1500000 | |
| 3000000 | |
| 3500000 | |
| 4500000 | |
| 5000000 | |
| 6000000 | |
| 7500000 | |
| 9000000 | |
| 10500000 | |
| 12000000 | |
| 13079164 | |
| 15000000 | |
| 19500000 | |
| 22500000 | |
| 30000000 | |
| 37500000 | |
| 45000000 | |
| 60000000 | |
| 75000000 | |
| 90000000 | |
| 100000000 | |
| 150000000 | |
| 225000000 | |
| 300000000 | |
| 750000000 | |
| 1500000000 | |
| Sysmiss |