| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.5 | 3.94 | 2.93 |
| 2024 | 3.22 | 4.64 | 1.53 |
| 2023 | 3.21 | 5.01 | 1.9 |
| 2022 | 5.37 | 8.09 | 3.8 |
| 2021 | 4.54 | 7.47 | 2.88 |
| 2020 | 6.04 | 9.13 | 4.4 |
| 2019 | 5.75 | 7.72 | 4.46 |
| 2018 | 12.34 | 29.68 | 5.17 |
| 2017 | 24.23 | 44.36 | 11.8 |
| 2016 | 14.48 | 17.71 | 9.66 |
| 2015 | 23.31 | 48.74 | 12.09 |
| 2014 | 9.87 | 28.37 | 3.12 |
| 2013 | 3.2 | 3.97 | 2.48 |
| 2012 | 4.23 | 5.68 | 2.78 |
| 2011 | 7.75 | 11.21 | 3.89 |
| 2010 | 5.15 | 6.25 | 3.77 |
| 2009 | 3.9 | 6.69 | 2.76 |
| 2008 | 2.99 | 6.26 | 1.51 |