| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.1 | 2.87 | 1.57 |
| 2023 | 3.53 | 5.68 | 2.15 |
| 2022 | 4.7 | 6.26 | 3.67 |
| 2021 | 8.29 | 10.86 | 6.01 |
| 2020 | 14.84 | 22.25 | 6.18 |
| 2019 | 12.11 | 17.14 | 6.95 |
| 2018 | 9.61 | 13.04 | 7.08 |
| 2017 | 7.28 | 8.51 | 5.6 |
| 2016 | 10.72 | 14.87 | 7.89 |
| 2015 | 16.56 | 28.12 | 8.15 |
| 2014 | 9.19 | 10.86 | 7.67 |
| 2013 | 8.25 | 9.92 | 5.29 |