| 2021 | 51270 2020 | 47566 3704 | 7.8% 2020 1. | 6 2021 | | 6.9% | | | | | | | 54893 | 47975 | 7 | | 54261 | | 18 9 | | | 76334 74751 | 59765 | | 36629 | 36751 | 38820 | | 1. | 1 | | 2 | | | | | | | | | | 3 | | | 2. | | | | | | | | | | 3. | | | | | | | 4. | | | | | | 7 | | 5. | | GB / T 4754 - 2017 | | 6. | - 2021 | |