| Value | Category | Cases | |
|---|---|---|---|
| 1 | 20 | 40 |
1.9%
|
| 2 | 30 | 29 |
1.4%
|
| 3 | 40 | 20 |
0.9%
|
| 4 | 50 | 36 |
1.7%
|
| 5 | 60 | 7 |
0.3%
|
| 6 | 70 | 2 |
0.1%
|
| 7 | 80 | 5 |
0.2%
|
| 8 | 100 | 8 |
0.4%
|
| 9 | 150 | 2 |
0.1%
|
| Missing value | 1990 |
93%
|