| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.88 | 4.52 | 3.64 |
| 2024 | 3.99 | 4.58 | 3.26 |
| 2023 | 4.53 | 6.8 | 3.88 |
| 2022 | 4.54 | 5.87 | 3.63 |
| 2021 | 4.89 | 6.14 | 4.39 |
| 2020 | 5.23 | 6.37 | 4.61 |
| 2019 | 4.96 | 5.54 | 4.57 |
| 2018 | 5.35 | 6.12 | 4.46 |
| 2017 | 6.76 | 8.19 | 5.82 |
| 2016 | 7.66 | 9.63 | 6.39 |
| 2015 | 9.61 | 15.8 | 6.74 |
| 2014 | 6.88 | 8.27 | 5.93 |
| 2013 | 7.03 | 8.59 | 6.01 |
| 2012 | 6.61 | 7.52 | 5.56 |
| 2011 | 9.03 | 11.19 | 6.63 |
| 2010 | 11.26 | 12.73 | 9.76 |