| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.71 | 1.84 | 1.46 |
| 2024 | 1.11 | 1.91 | 0.72 |
| 2023 | 2.07 | 4.28 | 1 |
| 2022 | 5.45 | 9.34 | 3.8 |
| 2021 | 8.06 | 12.48 | 6.14 |
| 2020 | 3.22 | 6.9 | 2.01 |
| 2019 | 2.15 | 3.03 | 1.68 |
| 2018 | 3.99 | 6.59 | 2.23 |
| 2017 | 6.38 | 11.11 | 4.04 |
| 2016 | 4.85 | 5.88 | 3.99 |
| 2015 | 5.54 | 8.08 | 3.55 |
| 2014 | 3.94 | 4.96 | 3.03 |
| 2013 | 4.78 | 6.35 | 3.51 |
| 2012 | 4.15 | 5.28 | 3.08 |
| 2011 | 6.48 | 9.12 | 3.79 |