| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.03 | 1.49 | 0.88 |
| 2024 | 0.84 | 1.42 | 0.57 |
| 2023 | 1.48 | 2.76 | 0.84 |
| 2022 | 3.18 | 4.54 | 2.03 |
| 2021 | 5.61 | 8.25 | 4.02 |
| 2020 | 3.6 | 5.75 | 2.89 |
| 2019 | 3.55 | 4.45 | 2.61 |
| 2018 | 4.24 | 6.29 | 2.29 |
| 2017 | 6.9 | 8.45 | 5.8 |
| 2016 | 8.48 | 10.38 | 6.91 |
| 2015 | 17.27 | 32.15 | 6.8 |
| 2014 | 14.67 | 18.91 | 11.69 |
| 2013 | 11 | 16.08 | 8.42 |
| 2012 | 6.73 | 9.13 | 4.85 |