| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.12 | 4.94 | 3.39 |
| 2024 | 3.02 | 5.17 | 2.27 |
| 2023 | 3.55 | 5.58 | 2.06 |
| 2022 | 2.29 | 3.49 | 1.7 |
| 2021 | 2.34 | 3.29 | 1.76 |
| 2020 | 2.69 | 3.63 | 1.93 |
| 2019 | 2.14 | 3.36 | 1.23 |
| 2018 | 2.39 | 3.82 | 1.2 |
| 2017 | 4.64 | 6.45 | 3.65 |
| 2016 | 10.66 | 20.23 | 6.31 |
| 2015 | 14.66 | 23.4 | 7.76 |
| 2014 | 11.54 | 16.11 | 7.54 |
| 2013 | 8.99 | 13.56 | 5.22 |
| 2012 | 6.43 | 9.01 | 4.47 |
| 2011 | 6.27 | 8.55 | 5.32 |
| 2010 | 6.48 | 7.58 | 5.47 |