| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.95 | 2.19 | 1.72 |
| 2024 | 2.12 | 2.61 | 1.35 |
| 2023 | 2.04 | 2.23 | 1.6 |
| 2022 | 1.61 | 1.9 | 1.2 |
| 2021 | 2.28 | 2.86 | 1.63 |
| 2020 | 2.34 | 2.9 | 1.97 |
| 2019 | 2.35 | 2.85 | 1.84 |
| 2018 | 2.32 | 3.27 | 1.69 |
| 2017 | 4.53 | 6.29 | 3.04 |
| 2016 | 6.71 | 8.34 | 5.48 |
| 2015 | 8.62 | 12.42 | 5.07 |
| 2014 | 4.96 | 6.93 | 3.5 |
| 2013 | 3.25 | 3.99 | 2.65 |
| 2012 | 3.87 | 5.06 | 2.74 |
| 2011 | 5.87 | 8.42 | 4 |
| 2010 | 7.35 | 9.09 | 5.78 |
| 2009 | 5.62 | 9.31 | 4.5 |
| 2008 | 5.87 | 10.78 | 3.05 |