| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 |
0.3%
|
|
| 2 | 4 |
1.1%
|
|
| 7 | 2 |
0.6%
|
|
| 8 | 1 |
0.3%
|
|
| 10 | 1 |
0.3%
|
|
| 15 | 1 |
0.3%
|
|
| Missing value | 339 |
97.1%
|