| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.77 | 4.7 | 2.95 |
| 2024 | 3.28 | 4.58 | 2.61 |
| 2023 | 4.62 | 5.72 | 3.64 |
| 2022 | 3.61 | 4.94 | 2.83 |
| 2021 | 4.5 | 5.42 | 3.66 |
| 2020 | 6.76 | 8.85 | 4.66 |
| 2019 | 5.46 | 7 | 3.8 |
| 2018 | 7.82 | 11.99 | 3.73 |
| 2017 | 13.1 | 15.2 | 11.59 |
| 2016 | 15.34 | 18.86 | 12.17 |
| 2015 | 19.99 | 36.99 | 9.97 |
| 2014 | 9.69 | 15.23 | 5.87 |
| 2013 | 4.83 | 6.84 | 3.45 |
| 2012 | 3.35 | 3.88 | 2.74 |