| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.53 | 1.74 | 1.28 |
| 2024 | 1.3 | 1.81 | 0.98 |
| 2023 | 1.4 | 1.73 | 0.98 |
| 2022 | 1.18 | 1.54 | 0.95 |
| 2021 | 1.22 | 1.58 | 0.97 |
| 2020 | 1.96 | 2.5 | 1.51 |
| 2019 | 2.12 | 3.22 | 1.55 |
| 2018 | 2.1 | 3.19 | 1.33 |
| 2017 | 4.1 | 5.73 | 2.93 |
| 2016 | 7.14 | 10.36 | 5.53 |
| 2015 | 10.2 | 14.6 | 5.76 |
| 2014 | 6.78 | 10.2 | 4.76 |
| 2013 | 5.61 | 8.14 | 3.39 |