| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 5 |
0.1%
|
| 9 | 1 |
0%
|
|
| 12 | 12 |
0.2%
|
|
| 13 | 56 |
1%
|
|
| 14 | 298 |
5.4%
|
|
| 15 | 741 |
13.5%
|
|
| 16 | 978 |
17.8%
|
|
| 17 | 1055 |
19.2%
|
|
| 18 | 862 |
15.7%
|
|
| 19 | 626 |
11.4%
|
|
| 20 | 361 |
6.6%
|
|
| 21 | 196 |
3.6%
|
|
| 22 | 109 |
2%
|
|
| 23 | 92 |
1.7%
|
|
| 24 | 47 |
0.9%
|
|
| 25 | 15 |
0.3%
|
|
| 26 | 11 |
0.2%
|
|
| 27 | 2 |
0%
|
|
| 29 | 2 |
0%
|
|
| 33 | 1 |
0%
|
|
| 41 | 1 |
0%
|
|
| 98 | Don't know | 10 |
0.2%
|