| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.89 | 4.06 | 3.78 |
| 2024 | 4.02 | 4.72 | 3.19 |
| 2023 | 6.93 | 10.08 | 4.68 |
| 2022 | 8.9 | 10.92 | 7.03 |
| 2021 | 12.6 | 18.98 | 10.29 |
| 2020 | 8.7 | 16.98 | 5.02 |
| 2019 | 6.7 | 8.19 | 5.58 |
| 2018 | 8.27 | 10.79 | 5.32 |
| 2017 | 7.61 | 9.6 | 5.99 |
| 2016 | 6.17 | 7.04 | 5.37 |
| 2015 | 6.23 | 7.92 | 4.91 |
| 2014 | 4.12 | 6.02 | 2.55 |
| 2013 | 3.64 | 6.52 | 2.45 |
| 2012 | 9.34 | 12.43 | 5.54 |
| 2011 | 12.49 | 15.8 | 9.3 |
| 2010 | 15.08 | 18.87 | 11.91 |