| 年份 | 实际值 | 预测值 | 残差 | 相对残差 |
| 2009 | 2.89 | - | - | - |
| 2010 | 5.97 | 6.13 | −0.16 | −0.02 |
| 2011 | 5.7 | 5.73 | −0.03 | −0.01 |
| 2012 | 5.04 | 5.36 | −0.32 | −0.06 |
| 2013 | 5.73 | 5.02 | 0.71 | 0.12 |
| 2014 | 4.83 | 4.69 | 0.14 | 0.03 |
| 2015 | 4.58 | 4.39 | 0.19 | 0.04 |
| 2016 | 3.76 | 4.10 | −0.34 | −0.09 |
| 2017 | 3.71 | 3.84 | −0.13 | −0.03 |
| 2018 | 3.52 | 3.59 | −0.05 | −0.07 |
| 2019 |
| 3.36 |
|
|
| 2020 |
| 3.14 |
|
|
| 2021 |
| 2.94 |
|
|
| 2022 |
| 2.75 |
|
|
| 2023 |
| 2.57 |
|
|
| 2024 |
| 2.40 |
|
|
| 2025 |
| 2.25 |
|
|