| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.83 | 4.19 | 3.19 |
| 2024 | 2.99 | 4.92 | 2.23 |
| 2023 | 3.95 | 5.27 | 3.42 |
| 2022 | 3.91 | 5.54 | 3.02 |
| 2021 | 5.61 | 6.96 | 4.9 |
| 2020 | 5.87 | 8.93 | 4.63 |
| 2019 | 4.35 | 5.85 | 3.33 |
| 2018 | 4.92 | 7.46 | 3.11 |
| 2017 | 9.68 | 12.91 | 6.91 |
| 2016 | 14.3 | 19.01 | 11.8 |
| 2015 | 17.37 | 31.28 | 10.83 |
| 2014 | 12.61 | 17.78 | 9.53 |
| 2013 | 11.5 | 17.81 | 6.7 |
| 2012 | 6.91 | 10.06 | 5.25 |