| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.42 | 1.6 | 1.19 |
| 2024 | 1.46 | 1.92 | 0.99 |
| 2023 | 2.06 | 3.38 | 1.22 |
| 2022 | 3.07 | 3.82 | 2.38 |
| 2021 | 1.83 | 3.53 | 1.22 |
| 2020 | 1.56 | 2.23 | 1.25 |
| 2019 | 1.31 | 1.68 | 1.02 |
| 2018 | 1.4 | 1.78 | 1.11 |
| 2017 | 4.44 | 10.34 | 1.39 |
| 2016 | 11.85 | 17.03 | 9.25 |
| 2015 | 26.5 | 54.01 | 15.32 |
| 2014 | 21.29 | 71.61 | 8.49 |
| 2013 | 7.87 | 10 | 5.92 |
| 2012 | 9.83 | 13.34 | 6.34 |
| 2011 | 18.84 | 27.49 | 9.04 |
| 2010 | 13.62 | 17.08 | 10.06 |
| 2009 | 10.43 | 18.26 | 6.99 |
| 2008 | 8.28 | 18.18 | 3.78 |