| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.41 | 6.1 | 3.51 |
| 2024 | 3.52 | 5.15 | 2.56 |
| 2023 | 5.6 | 6.51 | 4.23 |
| 2022 | 5.86 | 8.13 | 4.74 |
| 2021 | 7.53 | 11.27 | 5.32 |
| 2020 | 3.49 | 6.71 | 1.95 |
| 2019 | 1.77 | 2.29 | 1.23 |
| 2018 | 1.32 | 1.68 | 1.01 |
| 2017 | 2.21 | 2.78 | 1.54 |
| 2016 | 2.76 | 4 | 2.03 |
| 2015 | 7.04 | 11.96 | 3.65 |
| 2014 | 5.59 | 8.14 | 4.12 |
| 2013 | 4.72 | 6.47 | 3.25 |
| 2012 | 7.26 | 9.63 | 4.93 |
| 2011 | 9.34 | 12.91 | 7.58 |
| 2010 | 11.88 | 15.1 | 8.9 |