| Value | Category | Cases | |
|---|---|---|---|
| -5 | Missing; Not available | 1 |
0.1%
|
| -2 | No answer | 5 |
0.4%
|
| -1 | Don't know | 553 |
45.5%
|
| 1 | France | 133 |
10.9%
|
| 2 | China | 147 |
12.1%
|
| 3 | India | 376 |
30.9%
|