| 索引项 | 原始值 | 级比值 |
| 2015 | 8250.01 | - |
| 2016 | 8755.21 | 0.942 |
| 2017 | 9258.4 | 0.946 |
| 2018 | 10100.96 | 0.917 |
| 2019 | 10739.76 | 0.941 |
| 2020 | 11233.52 | 0.956 |
| 2021 | 11709.01 | 0.959 |