| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.18 | 1.52 | 1.01 |
| 2024 | 1.16 | 1.53 | 0.9 |
| 2023 | 1.6 | 2.06 | 1.31 |
| 2022 | 1.82 | 2.36 | 1.23 |
| 2021 | 2.17 | 3.46 | 1.64 |
| 2020 | 1.61 | 2.29 | 1.15 |
| 2019 | 1.38 | 1.82 | 1.17 |
| 2018 | 1.5 | 2.5 | 1.08 |
| 2017 | 2.15 | 2.41 | 1.88 |
| 2016 | 2.14 | 2.73 | 1.72 |
| 2015 | 3.07 | 5.93 | 1.64 |
| 2014 | 3.32 | 3.94 | 2.25 |
| 2013 | 2.25 | 2.79 | 1.88 |
| 2012 | 2.79 | 3.96 | 1.66 |
| 2011 | 5.69 | 12.26 | 2.82 |
| 2010 | 9.19 | 10.89 | 7.37 |
| 2009 | 11.04 | 13.93 | 6.84 |