| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.53 | 5.13 | 3.92 |
| 2024 | 4.76 | 5.53 | 3.43 |
| 2023 | 4.08 | 5.15 | 3.34 |
| 2022 | 3.29 | 4.28 | 2.59 |
| 2021 | 3.66 | 4.83 | 2.92 |
| 2020 | 5.08 | 6.57 | 3.94 |
| 2019 | 5.05 | 8.29 | 3.72 |
| 2018 | 6.12 | 8.81 | 3.88 |
| 2017 | 12.24 | 16.32 | 8.44 |
| 2016 | 18.44 | 37.87 | 11.86 |
| 2015 | 30.55 | 59.32 | 15.97 |
| 2014 | 12.73 | 17.87 | 9.04 |
| 2013 | 10.35 | 12.95 | 7.66 |
| 2012 | 9.78 | 12.34 | 6.17 |
| 2011 | 19.1 | 39.64 | 10.13 |
| 2010 | 43.79 | 62.71 | 36.71 |