| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.84 | 0.91 | 0.76 |
| 2024 | 0.86 | 0.97 | 0.71 |
| 2023 | 1.24 | 1.52 | 0.9 |
| 2022 | 1.81 | 2.89 | 1.37 |
| 2021 | 3.45 | 5.54 | 2.34 |
| 2020 | 11.5 | 30.76 | 3.83 |
| 2019 | 8.4 | 10.32 | 7.26 |
| 2018 | 7.01 | 7.73 | 6.37 |
| 2017 | 8.79 | 11.41 | 7.22 |
| 2016 | 15.05 | 23.86 | 10.86 |
| 2015 | 27.27 | 48.73 | 17.59 |
| 2014 | 14.62 | 17.77 | 11.63 |
| 2013 | 10.3 | 17.48 | 3.48 |
| 2012 | 4.09 | 5.23 | 2.86 |
| 2011 | 6.25 | 7.98 | 4.65 |
| 2010 | 5.75 | 8.45 | 4.19 |
| 2009 | 5.14 | 6.28 | 4.16 |