| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.31 | 3.67 | 2.94 |
| 2024 | 2.95 | 4.35 | 2.18 |
| 2023 | 4.16 | 4.86 | 3.61 |
| 2022 | 4.44 | 5.41 | 3.72 |
| 2021 | 4.88 | 5.77 | 3.58 |
| 2020 | 6.78 | 9.02 | 5.09 |
| 2019 | 6.56 | 9.56 | 5.27 |
| 2018 | 7.37 | 10.25 | 5.18 |
| 2017 | 9.87 | 12.27 | 7.96 |
| 2016 | 14.03 | 19.23 | 11.98 |
| 2015 | 21.12 | 42.68 | 10.51 |
| 2014 | 11.47 | 15.92 | 7.95 |
| 2013 | 8.39 | 10.83 | 6.83 |
| 2012 | 7.83 | 9.72 | 6.42 |
| 2011 | 9.66 | 11.5 | 7.39 |
| 2010 | 10.48 | 12.26 | 8.89 |