| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.67 | 3.07 | 2.27 |
| 2024 | 2.72 | 3.51 | 2.23 |
| 2023 | 3.7 | 4.61 | 3.17 |
| 2022 | 3.71 | 4.64 | 2.98 |
| 2021 | 5.15 | 6.75 | 4.52 |
| 2020 | 5.89 | 12.04 | 3.02 |
| 2019 | 2.85 | 3.55 | 2.4 |
| 2018 | 3.14 | 4.15 | 2.31 |
| 2017 | 3.52 | 4.12 | 3.08 |
| 2016 | 4.65 | 7.18 | 3.61 |
| 2015 | 9.75 | 15.84 | 5.16 |
| 2014 | 7.84 | 11.12 | 4.96 |
| 2013 | 9.44 | 11.8 | 6.52 |
| 2012 | 5.3 | 6.8 | 4.08 |
| 2011 | 7.55 | 13.25 | 5.35 |
| 2010 | 12.21 | 14.85 | 9.8 |
| 2009 | 8.8 | 10.94 | 5.57 |
| 2008 | 6.61 | 10.52 | 3.3 |