| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.39 | 4.23 | 1.97 |
| 2024 | 2.33 | 3.5 | 1.65 |
| 2023 | 6.52 | 9.84 | 3.39 |
| 2022 | 9.63 | 12.56 | 6.77 |
| 2021 | 6.47 | 10.78 | 3.64 |
| 2020 | 4.91 | 6.5 | 3.87 |
| 2019 | 3.9 | 5.44 | 3.12 |
| 2018 | 3.93 | 5.28 | 2.81 |
| 2017 | 5.74 | 7.92 | 4.65 |
| 2016 | 6.81 | 8.11 | 5.31 |
| 2015 | 9.24 | 11.5 | 5.74 |
| 2014 | 6.92 | 8.8 | 5.1 |
| 2013 | 4.6 | 6.15 | 3.27 |
| 2012 | 3.18 | 3.93 | 2.43 |