| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.62 | 3.93 | 3.1 |
| 2024 | 3.25 | 3.9 | 2.57 |
| 2023 | 3.13 | 3.85 | 2.62 |
| 2022 | 3.03 | 4.37 | 2.29 |
| 2021 | 6.14 | 9.02 | 4.24 |
| 2020 | 5.72 | 8.31 | 3.94 |
| 2019 | 5.92 | 8.6 | 4.69 |
| 2018 | 4.51 | 6.31 | 3.63 |
| 2017 | 5.93 | 7.23 | 4.67 |
| 2016 | 10.15 | 17.03 | 6.69 |
| 2015 | 11.6 | 20.95 | 5.36 |
| 2014 | 4.81 | 7.03 | 3.22 |
| 2013 | 2.71 | 4.16 | 1.89 |
| 2012 | 2.2 | 2.82 | 1.55 |
| 2011 | 4.01 | 6.14 | 2.45 |
| 2010 | 4.86 | 6.11 | 4.04 |