| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.41 | 4.41 | 2.94 |
| 2024 | 4.05 | 5.92 | 2.94 |
| 2023 | 5.55 | 6.42 | 4.7 |
| 2022 | 5.3 | 6.84 | 3.64 |
| 2021 | 5.07 | 7.73 | 3.39 |
| 2020 | 4.23 | 5.3 | 3.09 |
| 2019 | 3.61 | 4.86 | 2.95 |
| 2018 | 3.3 | 5.08 | 2.23 |
| 2017 | 4.68 | 5.5 | 3.98 |
| 2016 | 6.97 | 11.92 | 4.11 |
| 2015 | 11.99 | 23.69 | 4.44 |
| 2014 | 4.78 | 6.75 | 3.87 |
| 2013 | 6.05 | 8.71 | 4.72 |
| 2012 | 8.27 | 11.14 | 5.38 |
| 2011 | 11.75 | 18.85 | 7.63 |
| 2010 | 21.88 | 31.77 | 13.1 |
| 2009 | 26.93 | 32.1 | 15.7 |