| Eastern Region | Central region | Western Region | |
| Logarithmic total exports | logarithmic total exports | logarithmic total exports | |
| VARIABLES | LnY_ex | LnY_ex | LnY_ex |
| lnHP | 0.522 | 2.714 | −4.485 |
| (0.422) | (5.442) | (3.420) | |
| lnHP^2 | −0.0243 | −0.159 | 0.275 |
| (0.0229) | (0.319) | (0.207) | |
| Constant | 10.71*** | −16.00 | 10.44 |
| (2.903) | (22.12) | (15.08) | |
| control variable | Y | Y | Y |
| Year fixed effect | Y | Y | Y |
| Individual fixation effect | Y | Y | Y |
| Observations | 240 | 128 | 176 |
| R-squared | 0.993 | 0.961 | 0.951 |
| Number of id | 15 | 8 | 11 |