| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.43 | 1.59 | 1.27 |
| 2024 | 1.71 | 2.47 | 1.14 |
| 2023 | 3.44 | 4.88 | 2.32 |
| 2022 | 3.82 | 5.41 | 2.57 |
| 2021 | 4.6 | 6.6 | 3.34 |
| 2020 | 4.44 | 5.7 | 3.34 |
| 2019 | 2.81 | 4.7 | 1.78 |
| 2018 | 2.5 | 4.12 | 1.52 |
| 2017 | 4.64 | 6.57 | 3.32 |
| 2016 | 7.7 | 10.17 | 5.25 |
| 2015 | 7.68 | 12.88 | 5.14 |
| 2014 | 6.27 | 7.42 | 4.99 |
| 2013 | 4.78 | 6.33 | 3.35 |
| 2012 | 4.87 | 6.63 | 3.37 |
| 2011 | 6.8 | 8.55 | 4.74 |
| 2010 | 4.82 | 6.74 | 3.47 |
| 2009 | 3.61 | 4.73 | 2.16 |
| 2008 | 3.55 | 7.19 | 1.33 |
| 2007 | 4.34 | 6.4 | 3.41 |