| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 10.61 | 13.09 | 8.81 |
| 2024 | 7.95 | 15.86 | 4.86 |
| 2023 | 6.9 | 11.6 | 4.98 |
| 2022 | 6.27 | 9.01 | 4.82 |
| 2021 | 4.06 | 8.81 | 2.13 |
| 2020 | 3.57 | 4.6 | 2.76 |
| 2019 | 3.12 | 4.32 | 2 |
| 2018 | 4.16 | 9.85 | 2.14 |
| 2017 | 7.21 | 9.03 | 5.97 |
| 2016 | 6.11 | 7.58 | 5.27 |
| 2015 | 11.69 | 23.45 | 5.79 |
| 2014 | 5.34 | 6.63 | 3.84 |
| 2013 | 4.77 | 7.34 | 2.94 |
| 2012 | 3.86 | 4.69 | 3.23 |
| 2011 | 4.65 | 6.17 | 3.3 |
| 2010 | 4.86 | 6.98 | 3.53 |
| 2009 | 3.48 | 4.43 | 2.43 |
| 2008 | 2.8 | 4.62 | 1.41 |