| Value | Category | Cases | |
|---|---|---|---|
| 1 | 6 | 7 |
2.2%
|
| 2 | 7 | 1 |
0.3%
|
| 3 | 8 | 1 |
0.3%
|
| 4 | 12 | 6 |
1.8%
|
| 5 | 18 | 2 |
0.6%
|
| 6 | 20 | 3 |
0.9%
|
| 7 | 23 | 3 |
0.9%
|
| Missing value | 302 |
92.9%
|