| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.33 | 3.51 | 1.64 |
| 2024 | 1.33 | 1.86 | 0.84 |
| 2023 | 2.79 | 4.17 | 1.78 |
| 2022 | 3.18 | 5.18 | 2.13 |
| 2021 | 4.88 | 7.1 | 3.56 |
| 2020 | 4.76 | 6.56 | 3.6 |
| 2019 | 4.16 | 7.05 | 2.01 |
| 2018 | 2.89 | 3.89 | 1.97 |
| 2017 | 3.91 | 5.16 | 3.02 |
| 2016 | 8.21 | 14.96 | 4.96 |
| 2015 | 10.1 | 17.57 | 4.65 |
| 2014 | 3.19 | 4.8 | 2.32 |
| 2013 | 3.14 | 4.23 | 2.4 |
| 2012 | 4.01 | 6.09 | 2.5 |
| 2011 | 8.14 | 12.44 | 5.09 |
| 2010 | 11.39 | 13.52 | 9.8 |
| 2009 | 9.52 | 11.48 | 7.99 |
| 2008 | 8.58 | 12.02 | 5.61 |