| Year | Ecological Welfare Performance (SD) | Year-on-Year Growth Rate (%) |
| 2019 | 0.652 | - |
| 2020 | 0.718 | 10.12 |
| 2021 | 0.795 | 10.72 |
| 2022 | 0.883 | 11.07 |
| 2023 | 0.976 | 10.53 |