| Value | Category | Cases | |
|---|---|---|---|
| 1 | 30 MT | 766 |
13.8%
|
| 2 | 40 MT | 361 |
6.5%
|
| 3 | 50 MT | 115 |
2.1%
|
| 4 | 60 MT | 35 |
0.6%
|
| 5 | 70 MT | 12 |
0.2%
|
| 6 | 80 MT | 16 |
0.3%
|
| 7 | 90 MT | 36 |
0.6%
|
| 8 | I don't know | 4203 |
75.8%
|
| Sysmiss | 55 |