| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.76 | 2.24 | 1.53 |
| 2024 | 2.17 | 3.29 | 1.53 |
| 2023 | 2.65 | 3.15 | 2.01 |
| 2022 | 3.37 | 5.36 | 2.1 |
| 2021 | 1.98 | 3.06 | 1.12 |
| 2020 | 4.7 | 7.78 | 2.21 |
| 2019 | 6.86 | 10.77 | 2.94 |
| 2018 | 2.1 | 2.63 | 1.48 |
| 2017 | 3.36 | 6.59 | 2.08 |
| 2016 | 7.53 | 13.56 | 5.06 |
| 2015 | 7.89 | 14.57 | 3.62 |
| 2014 | 4.28 | 5.79 | 3.39 |
| 2013 | 3.46 | 3.99 | 2.82 |
| 2012 | 3.75 | 4.33 | 3.34 |
| 2011 | 5.15 | 7.32 | 3.66 |
| 2010 | 5.47 | 6.89 | 4.07 |
| 2009 | 4.8 | 5.91 | 3.53 |
| 2008 | 4.27 | 6.71 | 2.59 |