| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.33 | 2.5 | 2.2 |
| 2024 | 1.79 | 2.72 | 1.43 |
| 2023 | 1.73 | 2.2 | 1.37 |
| 2022 | 1.82 | 2.28 | 1.57 |
| 2021 | 1.8 | 2.16 | 1.59 |
| 2020 | 1.66 | 2.22 | 0.98 |
| 2019 | 1.52 | 2.75 | 1.14 |
| 2018 | 3.21 | 5.41 | 1.23 |
| 2017 | 5.58 | 7.46 | 4.93 |
| 2016 | 7.16 | 9.29 | 6.24 |
| 2015 | 10.65 | 15.14 | 7.01 |
| 2014 | 10.7 | 12.92 | 9.27 |
| 2013 | 9.25 | 11.95 | 7.31 |
| 2012 | 8.47 | 10.13 | 6.89 |
| 2011 | 13.38 | 25.66 | 7.9 |
| 2010 | 22.91 | 28.73 | 12.21 |