| Value | Category | Cases | |
|---|---|---|---|
| -9 | missing | 3 |
0.1%
|
| -8 | dont know | 0 |
0%
|
| -7 | na | 0 |
0%
|
| 0 | not answered | 2013 |
99.4%
|
| 1 | yes | 10 |
0.5%
|