| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.79 | 3.71 | 2.31 |
| 2024 | 2.21 | 3.59 | 1.58 |
| 2023 | 3.01 | 3.38 | 2.72 |
| 2022 | 3.44 | 5.31 | 2.46 |
| 2021 | 4.29 | 5.53 | 3.35 |
| 2020 | 3.91 | 5.24 | 2.79 |
| 2019 | 3.31 | 4.63 | 2.75 |
| 2018 | 3.79 | 5.23 | 2.61 |
| 2017 | 5.85 | 7.4 | 4.66 |
| 2016 | 8.83 | 10.85 | 6.83 |
| 2015 | 9.84 | 14.76 | 5.15 |
| 2014 | 6.65 | 8.74 | 4.72 |
| 2013 | 3.95 | 5.84 | 2.78 |
| 2012 | 3.61 | 4.9 | 2.49 |
| 2011 | 4.81 | 6.59 | 3.78 |
| 2010 | 6.12 | 7.82 | 4.01 |
| 2009 | 3.86 | 4.43 | 3.02 |