| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 2.65 | 2.9 | 2.48 |
| 2025 | 2.26 | 2.97 | 1.78 |
| 2024 | 1.84 | 2.73 | 1.36 |
| 2023 | 2.02 | 2.28 | 1.67 |
| 2022 | 2.34 | 3.23 | 1.86 |
| 2021 | 2.8 | 3.99 | 2.03 |
| 2020 | 2.72 | 3.58 | 2.1 |
| 2019 | 3.56 | 5.15 | 2.61 |
| 2018 | 4.98 | 7.18 | 3.27 |
| 2017 | 6.04 | 8.32 | 5.09 |
| 2016 | 11.34 | 20.37 | 7.84 |
| 2015 | 17.57 | 27.72 | 11.35 |
| 2014 | 11.17 | 16.36 | 7.61 |
| 2013 | 8.29 | 10.29 | 6.36 |
| 2012 | 7.82 | 9.71 | 5.48 |