| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.05 | 7.95 | 4.44 |
| 2024 | 4.45 | 5.73 | 3.41 |
| 2023 | 3.44 | 4.91 | 2.85 |
| 2022 | 2.89 | 3.99 | 2.27 |
| 2021 | 2.95 | 4.02 | 2.46 |
| 2020 | 3.53 | 4.5 | 2.68 |
| 2019 | 4.02 | 6.78 | 2.88 |
| 2018 | 4.64 | 7.26 | 2.83 |
| 2017 | 6.54 | 10.8 | 4.15 |
| 2016 | 14.6 | 17.75 | 10.17 |
| 2015 | 16.01 | 22.52 | 8.55 |
| 2014 | 12.44 | 20.27 | 7.56 |
| 2013 | 7.69 | 12.87 | 3.45 |
| 2012 | 4.12 | 5.36 | 2.96 |
| 2011 | 5.7 | 8.89 | 3.84 |
| 2010 | 10.03 | 14.3 | 7.62 |