| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.62 | 7.68 | 4.43 |
| 2024 | 5.13 | 8.16 | 3.44 |
| 2023 | 7.03 | 10.11 | 3.37 |
| 2022 | 3.6 | 4.77 | 2.86 |
| 2021 | 3.49 | 4.95 | 2.74 |
| 2020 | 3.9 | 5.62 | 2.32 |
| 2019 | 2.45 | 3.54 | 1.76 |
| 2018 | 3.74 | 6.57 | 1.93 |
| 2017 | 7.85 | 11 | 5.41 |
| 2016 | 10.44 | 12.89 | 7.24 |
| 2015 | 17.29 | 29.9 | 7.13 |
| 2014 | 20.09 | 28.72 | 13.77 |
| 2013 | 12.48 | 16.96 | 8.58 |
| 2012 | 9.74 | 12.48 | 6.9 |
| 2011 | 13.9 | 16.87 | 11.14 |
| 2010 | 16.09 | 24.73 | 12.8 |
| 2009 | 18.53 | 22.48 | 7.94 |