| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.58 | 3.94 | 3.23 |
| 2024 | 3.65 | 4.8 | 2.83 |
| 2023 | 6.34 | 8.92 | 4.11 |
| 2022 | 8.06 | 10.27 | 7.01 |
| 2021 | 12.58 | 15.77 | 9.28 |
| 2020 | 11.24 | 14.66 | 7.5 |
| 2019 | 6.33 | 8.38 | 4.03 |
| 2018 | 3.98 | 4.86 | 2.91 |
| 2017 | 4.68 | 6.35 | 3.64 |
| 2016 | 6.88 | 8.06 | 5.93 |
| 2015 | 9.95 | 17.7 | 4.81 |
| 2014 | 9.05 | 12.85 | 6.57 |
| 2013 | 7.79 | 9.86 | 5.92 |
| 2012 | 6.65 | 8.07 | 5.19 |
| 2011 | 8.91 | 14.56 | 6.87 |
| 2010 | 12.85 | 16.12 | 9.89 |