| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.48 | 3.89 | 1.68 |
| 2023 | 5.1 | 7.39 | 3.63 |
| 2022 | 8.59 | 11.85 | 6.42 |
| 2021 | 13.23 | 20.81 | 9.42 |
| 2020 | 14.25 | 29.2 | 8.17 |
| 2019 | 9.19 | 12.21 | 7.46 |
| 2018 | 9.23 | 11.77 | 6.3 |
| 2017 | 7.68 | 10.7 | 5.16 |
| 2016 | 6.65 | 8.55 | 4.33 |
| 2015 | 6.31 | 8.16 | 3.49 |
| 2014 | 3.23 | 4.21 | 2.25 |
| 2013 | 2.44 | 2.87 | 2.09 |
| 2012 | 2.47 | 3.08 | 2.03 |
| 2011 | 3.36 | 4.26 | 2.55 |