| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.56 | 1.78 | 1.4 |
| 2024 | 1.53 | 2.48 | 1 |
| 2023 | 2.51 | 3 | 1.97 |
| 2022 | 2.91 | 5.44 | 2.12 |
| 2021 | 2.58 | 4.2 | 1.99 |
| 2020 | 2.87 | 3.86 | 1.87 |
| 2019 | 2.43 | 3.44 | 1.81 |
| 2018 | 3.24 | 5.24 | 1.76 |
| 2017 | 8.63 | 13.23 | 4.78 |
| 2016 | 14.41 | 18.8 | 11.63 |
| 2015 | 18.59 | 40.17 | 10.26 |
| 2014 | 11.15 | 16.21 | 8.41 |
| 2013 | 7.67 | 10.24 | 6.16 |
| 2012 | 6.77 | 8.66 | 5.22 |