| 年份 | 实际值 | 预测值 | 均方误差 |
| 2018 | −0.9684 | −1.1611 | 0.0312 |
| 2019 | −1.0698 | −1.2323 | |
| 2020 | −1.3134 | −1.4527 | |
| 2021 | −1.4121 | −1.3647 | |
| 2022 | −1.6323 | −1.3661 |