| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 0.86 | 1.19 | 0.63 |
| 2023 | 0.7 | 0.82 | 0.55 |
| 2022 | 0.64 | 0.82 | 0.5 |
| 2021 | 1.02 | 1.42 | 0.73 |
| 2020 | 1.33 | 2.98 | 0.76 |
| 2019 | 3.36 | 4.23 | 1.85 |
| 2018 | 5.49 | 9.89 | 2.9 |
| 2017 | 10.74 | 20.56 | 5.89 |
| 2016 | 14.99 | 19.24 | 11.17 |
| 2015 | 12.59 | 20.63 | 6.7 |
| 2014 | 5.68 | 7.43 | 4.55 |
| 2013 | 7.01 | 9.12 | 6.12 |