| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 4.29 | 4.88 | 3.55 |
| 2025 | 3.02 | 3.69 | 2.19 |
| 2024 | 2.02 | 3.38 | 1.48 |
| 2023 | 2.58 | 3.35 | 2.2 |
| 2022 | 2.54 | 3.53 | 1.97 |
| 2021 | 3.89 | 5.23 | 3.26 |
| 2020 | 4.16 | 6.38 | 3.03 |
| 2019 | 3.35 | 4.65 | 2.57 |
| 2018 | 3.61 | 4.83 | 2.53 |
| 2017 | 7.13 | 9.11 | 4.48 |
| 2016 | 8.96 | 11.7 | 7.17 |
| 2015 | 11.66 | 22.99 | 6.48 |
| 2014 | 6.96 | 9.79 | 5.27 |
| 2013 | 5.9 | 9.28 | 3.33 |
| 2012 | 3.09 | 4.52 | 2.6 |