| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.76 | 6.82 | 4.43 |
| 2024 | 5.75 | 9.11 | 3.66 |
| 2023 | 4.5 | 6.92 | 1.95 |
| 2022 | 2.3 | 2.81 | 1.79 |
| 2021 | 2.28 | 2.7 | 1.76 |
| 2020 | 2.61 | 3.28 | 2.04 |
| 2019 | 2.58 | 3.56 | 1.72 |
| 2018 | 2.44 | 3.58 | 1.62 |
| 2017 | 5.73 | 9.11 | 3.31 |
| 2016 | 8.69 | 13.22 | 4.82 |
| 2015 | 5.13 | 7.85 | 3.14 |
| 2014 | 3.7 | 6.01 | 2.04 |
| 2013 | 2.84 | 3.44 | 2.2 |
| 2012 | 2.95 | 4.3 | 2.23 |
| 2011 | 4.64 | 6.33 | 2.66 |
| 2010 | 4.88 | 6.97 | 3.5 |
| 2009 | 4.41 | 6.77 | 3.22 |