| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.9 | 8.66 | 4.98 |
| 2024 | 3.99 | 9.21 | 2.56 |
| 2023 | 5.26 | 7.89 | 3.3 |
| 2022 | 4.07 | 8.14 | 2.71 |
| 2021 | 4.78 | 6.86 | 3.3 |
| 2020 | 2.36 | 4.94 | 0.91 |
| 2019 | 1.58 | 2.15 | 1.21 |
| 2018 | 3.52 | 6.85 | 1.69 |
| 2017 | 9.62 | 13.11 | 6.1 |
| 2016 | 20.79 | 38.98 | 11.73 |
| 2015 | 34.93 | 52.87 | 23 |
| 2014 | 15.41 | 34.69 | 3.64 |
| 2013 | 2.9 | 3.66 | 2.16 |
| 2012 | 2.48 | 3.29 | 1.96 |
| 2011 | 3.98 | 5.57 | 2.4 |