| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.04 | 1.2 | 0.88 |
| 2025 | 1.23 | 1.88 | 0.78 |
| 2024 | 2.85 | 4.12 | 1.55 |
| 2023 | 4.34 | 5.77 | 3.5 |
| 2022 | 5.35 | 6.83 | 3.98 |
| 2021 | 4.36 | 7.37 | 3.41 |
| 2020 | 3.97 | 6.49 | 2.36 |
| 2019 | 2.56 | 3.29 | 1.75 |
| 2018 | 2.48 | 3.61 | 1.76 |
| 2017 | 4.25 | 5.2 | 3.34 |
| 2016 | 7.56 | 10.76 | 4.79 |
| 2015 | 8.29 | 11.14 | 4.83 |
| 2014 | 5.03 | 7.3 | 3.73 |
| 2013 | 3.92 | 5.43 | 2.99 |
| 2012 | 5.14 | 7.66 | 3.29 |
| 2011 | 11.75 | 18.17 | 7.19 |