| 年份 | GM (1, 1)预测结果 | ||
| 2011~2019 | 2011~2014 | 2015~2019 | |
| 2020 | 2.41 | 3.12 | 2.34 |
| 2021 | 2.40 | 3.23 | 2.31 |
| 2022 | 2.40 | 3.34 | 2.28 |
| 2023 | 2.39 | 3.46 | 2.26 |
| 2024 | 2.39 | 3.58 | 2.23 |
| 2025 | 2.38 | 3.71 | 2.20 |
| p | 0.98 | 1.00 | 1.00 |
| c | 0.79 | 0.03 | 0.27 |