| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.83 | 2.36 | 1.45 |
| 2024 | 1.33 | 1.75 | 1.02 |
| 2023 | 1.92 | 2.92 | 1.43 |
| 2022 | 1.76 | 2.64 | 1.24 |
| 2021 | 1.66 | 2.54 | 1.3 |
| 2020 | 3.5 | 5.14 | 2.31 |
| 2019 | 4.25 | 5.99 | 2.85 |
| 2018 | 4.19 | 5.26 | 3.46 |
| 2017 | 5.31 | 7.39 | 3.93 |
| 2016 | 7.42 | 9.93 | 6 |
| 2015 | 12.53 | 24.75 | 7.83 |
| 2014 | 8.5 | 11.82 | 6.3 |
| 2013 | 5.35 | 7.45 | 4.3 |
| 2012 | 5.48 | 6.66 | 3.83 |
| 2011 | 6.31 | 7.68 | 5.4 |