| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.3 | 1.43 | 1 |
| 2024 | 1.45 | 2.01 | 0.88 |
| 2023 | 3.8 | 7.27 | 1.68 |
| 2022 | 8.03 | 11.07 | 5.03 |
| 2021 | 5.53 | 10.31 | 2.69 |
| 2020 | 6.91 | 20.98 | 2.11 |
| 2019 | 4.55 | 12.67 | 2.55 |
| 2018 | 3.67 | 4.9 | 2.56 |
| 2017 | 4.79 | 6.16 | 3.68 |
| 2016 | 5.12 | 6.29 | 3.55 |
| 2015 | 6.38 | 14.72 | 3.04 |
| 2014 | 5.3 | 11.76 | 2.06 |
| 2013 | 1.68 | 2.67 | 1.19 |
| 2012 | 1.55 | 2.12 | 1.06 |
| 2011 | 2.68 | 3.53 | 1.49 |