| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.36 | 1.69 | 1.19 |
| 2024 | 1.09 | 1.81 | 0.78 |
| 2023 | 1.5 | 1.89 | 1.22 |
| 2022 | 1.81 | 2.86 | 1.4 |
| 2021 | 2.02 | 3.29 | 1.39 |
| 2020 | 1.72 | 2.4 | 1.24 |
| 2019 | 1.69 | 2.33 | 1.39 |
| 2018 | 2.27 | 2.88 | 1.66 |
| 2017 | 3.43 | 4.53 | 2.53 |
| 2016 | 5.48 | 9.05 | 4.29 |
| 2015 | 14.44 | 23.02 | 5.02 |
| 2014 | 3.65 | 5.72 | 2.51 |
| 2013 | 3.6 | 4.98 | 2.7 |
| 2012 | 3.11 | 4.26 | 2.24 |
| 2011 | 4.2 | 5.27 | 2.91 |
| 2010 | 5.12 | 6.01 | 3.79 |
| 2009 | 4.88 | 5.99 | 4.11 |
| 2008 | 4.23 | 6.61 | 2.51 |