| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 3.77 | 4.03 | 3.34 |
| 2025 | 3.52 | 4.35 | 2.73 |
| 2024 | 2.58 | 4.18 | 1.77 |
| 2023 | 3.33 | 4.1 | 2.36 |
| 2022 | 2.76 | 3.73 | 2.2 |
| 2021 | 2.92 | 3.81 | 2.46 |
| 2020 | 3.61 | 4.38 | 3.04 |
| 2019 | 3.83 | 5.5 | 2.83 |
| 2018 | 5.31 | 6.94 | 3.74 |
| 2017 | 10.27 | 16.76 | 6.13 |
| 2016 | 14.81 | 17.92 | 12.98 |
| 2015 | 21.06 | 33.44 | 15.35 |
| 2014 | 16.71 | 22.84 | 11.56 |
| 2013 | 10.89 | 14.37 | 8.39 |
| 2012 | 8.1 | 9.38 | 6.9 |
| 2011 | 10.89 | 19.31 | 7.42 |