| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.61 | 3.91 | 3.33 |
| 2024 | 4.09 | 4.95 | 3.3 |
| 2023 | 5.37 | 6.64 | 4.52 |
| 2022 | 5.46 | 7.72 | 4.42 |
| 2021 | 7.63 | 10.47 | 6.74 |
| 2020 | 7.55 | 10.86 | 5.15 |
| 2019 | 6.75 | 9.4 | 5.57 |
| 2018 | 9.86 | 12.63 | 7.01 |
| 2017 | 8.81 | 12.25 | 7.44 |
| 2016 | 11.65 | 18.25 | 8.58 |
| 2015 | 12.26 | 23.13 | 7 |
| 2014 | 6.72 | 8.49 | 5.55 |
| 2013 | 6.04 | 7.69 | 4.07 |
| 2012 | 3.78 | 4.42 | 3.19 |
| 2011 | 5 | 6.6 | 3.95 |
| 2010 | 7.12 | 8.25 | 6.19 |