| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.27 | 5.78 | 4.5 |
| 2024 | 4.55 | 6.09 | 3.57 |
| 2023 | 5.11 | 7.01 | 3.39 |
| 2022 | 4.37 | 6.66 | 3.35 |
| 2021 | 6.46 | 7.71 | 5.16 |
| 2020 | 7.98 | 11.48 | 4.95 |
| 2019 | 6.69 | 9.62 | 5.24 |
| 2018 | 10.19 | 16.4 | 6.2 |
| 2017 | 18.43 | 23.08 | 14.82 |
| 2016 | 10.21 | 18.26 | 5.38 |
| 2015 | 6 | 10.47 | 1.9 |
| 2014 | 1.11 | 2.15 | 0.83 |
| 2013 | 1.14 | 1.56 | 0.87 |
| 2012 | 1.2 | 1.62 | 0.9 |
| 2011 | 1.73 | 2.24 | 1.08 |
| 2010 | 2.05 | 2.05 | 2.05 |