| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8 | 9.95 | 6.67 |
| 2024 | 5.43 | 11.94 | 3.99 |
| 2023 | 6.3 | 9.04 | 4.17 |
| 2022 | 3.84 | 5.35 | 2.67 |
| 2021 | 4.05 | 5.34 | 3.15 |
| 2020 | 5.39 | 7.4 | 3.65 |
| 2019 | 4.34 | 5.92 | 2.81 |
| 2018 | 4.93 | 9.13 | 2.92 |
| 2017 | 7.1 | 10.57 | 4.59 |
| 2016 | 16.15 | 23.51 | 9.94 |
| 2015 | 11.13 | 27.61 | 6.76 |
| 2014 | 4.98 | 9.52 | 2.51 |
| 2013 | 1.97 | 2.78 | 1.18 |
| 2012 | 1.3 | 1.89 | 1.03 |
| 2011 | 1.95 | 2.69 | 1.11 |
| 2010 | 3.69 | 5.06 | 2.31 |
| 2009 | 2.6 | 4.58 | 1.04 |
| 2008 | 1.4 | 2.58 | 0.65 |