| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.91 | 6.15 | 4.01 |
| 2024 | 5.2 | 8.04 | 3.65 |
| 2023 | 4.58 | 10.21 | 3.06 |
| 2022 | 2.8 | 3.71 | 2.12 |
| 2021 | 2.81 | 3.44 | 2.4 |
| 2020 | 3.32 | 4.09 | 2.66 |
| 2019 | 3.36 | 4.49 | 2.36 |
| 2018 | 2.87 | 3.98 | 2 |
| 2017 | 4.38 | 5.48 | 3.74 |
| 2016 | 4.85 | 6.22 | 4.26 |
| 2015 | 8.01 | 11.83 | 5.85 |
| 2014 | 5 | 6.72 | 4.14 |
| 2013 | 4.43 | 5.43 | 3.68 |
| 2012 | 5.21 | 7.18 | 3.1 |
| 2011 | 7.71 | 9.25 | 6.43 |
| 2010 | 8.58 | 10.92 | 6.1 |
| 2009 | 5.92 | 7.58 | 5.24 |