| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.62 | 1.82 | 1.46 |
| 2024 | 1.41 | 1.94 | 1.09 |
| 2023 | 1.96 | 3 | 1.48 |
| 2022 | 2.32 | 3.39 | 1.74 |
| 2021 | 2.1 | 3.46 | 1.45 |
| 2020 | 1.72 | 2.09 | 1.44 |
| 2019 | 1.81 | 2.72 | 1.22 |
| 2018 | 1.73 | 2.44 | 1.19 |
| 2017 | 2.84 | 3.53 | 2.25 |
| 2016 | 3.44 | 4.48 | 2.92 |
| 2015 | 5.22 | 7.94 | 3.77 |
| 2014 | 4.87 | 6.04 | 4.47 |
| 2013 | 7.8 | 10.66 | 5.43 |
| 2012 | 8.6 | 10.9 | 6.6 |
| 2011 | 13.18 | 17.15 | 9.97 |
| 2010 | 10.59 | 15.96 | 6.8 |
| 2009 | 5.82 | 9.13 | 3.54 |
| 2008 | 5.39 | 9.95 | 2.46 |