| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 5.26 | 6.9 | 4.58 |
| 2025 | 4.59 | 6.51 | 3.19 |
| 2024 | 3.17 | 4.33 | 2.57 |
| 2023 | 3.37 | 3.79 | 2.89 |
| 2022 | 3.51 | 4.47 | 2.66 |
| 2021 | 3.64 | 4.8 | 3.15 |
| 2020 | 2.89 | 3.57 | 2.16 |
| 2019 | 2.48 | 3.44 | 2.02 |
| 2018 | 4.09 | 5.27 | 1.64 |
| 2017 | 6.74 | 10.09 | 4.71 |
| 2016 | 7.93 | 10.38 | 5.62 |
| 2015 | 8.01 | 15.56 | 4.86 |
| 2014 | 5.42 | 6.79 | 4.68 |
| 2013 | 5.07 | 7.07 | 3.4 |
| 2012 | 3.4 | 4.45 | 2.22 |
| 2011 | 3.65 | 4.76 | 2.56 |
| 2010 | 3.25 | 4.32 | 2.53 |
| 2009 | 2.22 | 3.19 | 0.88 |
| 2008 | 0.9 | 1.68 | 0.59 |