| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.91 | 4.26 | 3.49 |
| 2024 | 3.21 | 5.09 | 2.03 |
| 2023 | 4.01 | 4.76 | 3.4 |
| 2022 | 4.62 | 7.07 | 3.47 |
| 2021 | 3.6 | 7.6 | 1.25 |
| 2020 | 1.63 | 2.66 | 0.87 |
| 2019 | 2.8 | 3.84 | 2.14 |
| 2018 | 3.35 | 4.5 | 2.14 |
| 2017 | 4.28 | 5.57 | 3.5 |
| 2016 | 11.69 | 27.26 | 5.16 |
| 2015 | 11.42 | 22.79 | 5.74 |
| 2014 | 5.78 | 8.19 | 4.67 |
| 2013 | 4.26 | 6.16 | 3.18 |
| 2012 | 3.77 | 4.55 | 2.8 |
| 2011 | 8.13 | 12.12 | 3.39 |
| 2010 | 5.03 | 7.86 | 3.91 |
| 2009 | 3.93 | 5.2 | 2.4 |
| 2008 | 4.65 | 12.96 | 1.4 |