| Value | Category | Cases | |
|---|---|---|---|
| -5 | Missing; Not available | 1 |
0.1%
|
| -2 | No answer | 18 |
1.7%
|
| -1 | Don't know | 296 |
28.5%
|
| 1 | France | 235 |
22.6%
|
| 2 | China | 183 |
17.6%
|
| 3 | India | 306 |
29.5%
|