| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.33 | 11.05 | 5.15 |
| 2024 | 3.43 | 5.86 | 1.64 |
| 2023 | 3.19 | 3.99 | 2.31 |
| 2022 | 2.3 | 3.33 | 1.51 |
| 2021 | 3.18 | 4.35 | 2.43 |
| 2020 | 3.26 | 4.32 | 2.32 |
| 2019 | 2.53 | 4.09 | 1.24 |
| 2018 | 1.57 | 2.02 | 1.23 |
| 2017 | 2.04 | 2.6 | 1.63 |
| 2016 | 3.05 | 4.1 | 2.51 |
| 2015 | 4.84 | 10.65 | 2.41 |
| 2014 | 2.07 | 2.49 | 1.73 |
| 2013 | 1.96 | 2.62 | 1.62 |
| 2012 | 3.06 | 4.99 | 1.68 |
| 2011 | 6.97 | 10.58 | 4.17 |
| 2010 | 8.67 | 11.49 | 6.74 |
| 2009 | 8.7 | 11.95 | 6.17 |
| 2008 | 6.94 | 9.15 | 5 |