| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.42 | 3.08 | 1.75 |
| 2024 | 2.3 | 4.64 | 1.29 |
| 2023 | 2.42 | 3.02 | 1.92 |
| 2022 | 2.02 | 3.09 | 1.51 |
| 2021 | 2.23 | 3.56 | 1.86 |
| 2020 | 2.39 | 2.82 | 2.04 |
| 2019 | 2.5 | 3.15 | 2.19 |
| 2018 | 2.75 | 3.68 | 2.05 |
| 2017 | 4.47 | 5.85 | 3.56 |
| 2016 | 6.35 | 10.22 | 4.35 |
| 2015 | 6.9 | 12.61 | 3.91 |
| 2014 | 4.63 | 6.06 | 3.38 |
| 2013 | 3.42 | 5.11 | 2.41 |
| 2012 | 3.21 | 5.98 | 1.96 |
| 2011 | 7.12 | 9.14 | 4.99 |
| 2010 | 8.03 | 11.14 | 5.92 |
| 2009 | 5.15 | 6.57 | 3.14 |