| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.7 | 4.21 | 2.3 |
| 2024 | 1.64 | 4.76 | 0.84 |
| 2023 | 1.62 | 1.91 | 1.05 |
| 2022 | 1.13 | 1.52 | 0.82 |
| 2021 | 1.04 | 1.63 | 0.63 |
| 2020 | 1 | 1.19 | 0.83 |
| 2019 | 1.21 | 1.72 | 0.94 |
| 2018 | 2.43 | 3.77 | 1.07 |
| 2017 | 4.63 | 7.33 | 2.71 |
| 2016 | 9.41 | 13.32 | 5.79 |
| 2015 | 8.27 | 14.16 | 5.42 |
| 2014 | 6.24 | 8.51 | 3.84 |
| 2013 | 4.69 | 5.49 | 3.98 |
| 2012 | 5.54 | 7.67 | 3.94 |
| 2011 | 10.52 | 12.5 | 5.56 |
| 2010 | 7.83 | 11.57 | 5.14 |
| 2009 | 4.07 | 5.59 | 2.31 |
| 2008 | 3.44 | 5.74 | 1.83 |
| 2007 | 5.23 | 7.06 | 3.69 |