| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 9.3 | 11.78 | 7.46 |
| 2025 | 3.47 | 7.81 | 2.45 |
| 2024 | 2.74 | 3.94 | 2.03 |
| 2023 | 2.89 | 3.81 | 2.35 |
| 2022 | 2.76 | 4.15 | 2.19 |
| 2021 | 4.96 | 7.92 | 3.58 |
| 2020 | 9.65 | 12.44 | 6.94 |
| 2019 | 7.53 | 10.11 | 5.36 |
| 2018 | 10.98 | 20.09 | 5.94 |
| 2017 | 17.92 | 22.96 | 13.97 |
| 2016 | 13.53 | 17.21 | 10.66 |
| 2015 | 15.59 | 29.75 | 7.62 |
| 2014 | 5.75 | 8.47 | 3.96 |
| 2013 | 4.12 | 5.55 | 2.9 |
| 2012 | 3.22 | 4.43 | 2.31 |
| 2011 | 4.85 | 6.2 | 3.49 |