| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.38 | 9.23 | 6.28 |
| 2024 | 5.23 | 11.31 | 3.16 |
| 2023 | 4.47 | 6.86 | 3.59 |
| 2022 | 4.52 | 6.47 | 3.45 |
| 2021 | 3.45 | 6.32 | 2.47 |
| 2020 | 3.49 | 4.3 | 2.48 |
| 2019 | 2.63 | 3.32 | 1.82 |
| 2018 | 3.99 | 9.58 | 2.07 |
| 2017 | 7.15 | 8.79 | 5.96 |
| 2016 | 6.49 | 9.4 | 5.35 |
| 2015 | 11.18 | 20.57 | 5.89 |
| 2014 | 4.92 | 5.99 | 3.14 |
| 2013 | 2.45 | 3.18 | 1.88 |
| 2012 | 2.42 | 3.29 | 1.67 |
| 2011 | 3.8 | 5.07 | 2.49 |
| 2010 | 4.55 | 6.02 | 3.15 |
| 2009 | 4.35 | 5.38 | 3.3 |
| 2008 | 3.71 | 6.14 | 1.91 |