| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.44 | 4.88 | 4.03 |
| 2024 | 4.21 | 5.45 | 3.42 |
| 2023 | 5.56 | 8.59 | 4 |
| 2022 | 7.34 | 8.6 | 5.48 |
| 2021 | 7.87 | 9.51 | 6.14 |
| 2020 | 5.27 | 8.68 | 4.04 |
| 2019 | 4.31 | 5.43 | 3.51 |
| 2018 | 4.76 | 5.5 | 3.39 |
| 2017 | 4.46 | 5.37 | 3.74 |
| 2016 | 4.45 | 5.22 | 3.64 |
| 2015 | 5.2 | 8.53 | 3.27 |
| 2014 | 3.31 | 4.52 | 2.38 |
| 2013 | 2.95 | 3.73 | 2.51 |
| 2012 | 3.02 | 3.88 | 2.16 |
| 2011 | 5.16 | 7.33 | 3.28 |
| 2010 | 4.77 | 6.7 | 3.43 |
| 2009 | 4.04 | 5.26 | 3.05 |
| 2008 | 3.48 | 6.74 | 1.36 |