| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.77 | 2.09 | 1.5 |
| 2024 | 1.6 | 2.18 | 1.11 |
| 2023 | 2.38 | 2.69 | 1.6 |
| 2022 | 2.49 | 3.17 | 1.93 |
| 2021 | 2.35 | 3.3 | 1.65 |
| 2020 | 4.03 | 7.75 | 2.63 |
| 2019 | 2.46 | 3.04 | 2.01 |
| 2018 | 3.15 | 4.45 | 1.89 |
| 2017 | 6.65 | 9.35 | 4.22 |
| 2016 | 10.93 | 15.65 | 8.81 |
| 2015 | 17.99 | 33.11 | 8.26 |
| 2014 | 14.73 | 20.61 | 10.57 |
| 2013 | 10.16 | 15.51 | 6.72 |
| 2012 | 6.84 | 8.59 | 5.6 |