| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 10.11 | 12.73 | 7.85 |
| 2024 | 9.79 | 16.76 | 4.86 |
| 2023 | 15.5 | 20.69 | 11.73 |
| 2022 | 9.14 | 17.81 | 3.88 |
| 2021 | 5 | 9.11 | 2.15 |
| 2020 | 2.89 | 3.93 | 1.82 |
| 2019 | 2.21 | 3.01 | 1.8 |
| 2018 | 2.44 | 2.92 | 1.93 |
| 2017 | 3.34 | 4.71 | 2.61 |
| 2016 | 3.71 | 4.56 | 2.99 |
| 2015 | 5.34 | 8.43 | 2.88 |
| 2014 | 2.68 | 3.4 | 2.09 |
| 2013 | 3.11 | 4.13 | 2.41 |
| 2012 | 5.2 | 7.45 | 2.87 |
| 2011 | 9.38 | 12.5 | 6.83 |
| 2010 | 9.18 | 13.48 | 6.09 |
| 2009 | 7.6 | 9.61 | 6.22 |