| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.32 | 4.81 | 3.99 |
| 2024 | 4.31 | 5.53 | 3.19 |
| 2023 | 4.02 | 5.35 | 3.18 |
| 2022 | 3.57 | 4.49 | 3.01 |
| 2021 | 4.21 | 4.98 | 3.6 |
| 2020 | 5.2 | 6.28 | 4.44 |
| 2019 | 4.56 | 5.83 | 3.62 |
| 2018 | 4.9 | 7.07 | 3.72 |
| 2017 | 9.16 | 11.96 | 6.63 |
| 2016 | 13.05 | 17.52 | 10.14 |
| 2015 | 9.77 | 17.01 | 5.7 |
| 2014 | 4.78 | 6.93 | 3.57 |
| 2013 | 3.45 | 4.51 | 1.5 |
| 2012 | 1.51 | 1.85 | 1.32 |
| 2011 | 2.38 | 3.54 | 1.35 |
| 2010 | 3.21 | 4.25 | 2.49 |
| 2009 | 2.9 | 4.16 | 2.04 |