| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.16 | 1.44 | 0.87 |
| 2024 | 0.82 | 1.17 | 0.6 |
| 2023 | 1.13 | 1.46 | 0.86 |
| 2022 | 1.66 | 2.85 | 1.12 |
| 2021 | 1.8 | 2.97 | 1.24 |
| 2020 | 1.93 | 2.77 | 1.4 |
| 2019 | 1.55 | 2.49 | 0.94 |
| 2018 | 1.37 | 1.97 | 0.87 |
| 2017 | 2.97 | 4.47 | 1.79 |
| 2016 | 14.99 | 39.34 | 4.03 |
| 2015 | 11.18 | 46.62 | 5.13 |
| 2014 | 4.4 | 7.23 | 3.27 |
| 2013 | 4.22 | 6 | 3.2 |
| 2012 | 6.3 | 8.17 | 4.1 |
| 2011 | 8.49 | 11.05 | 5.49 |
| 2010 | 7.87 | 11.36 | 5.8 |
| 2009 | 4.85 | 6.92 | 2.85 |
| 2008 | 4.83 | 10.48 | 1.83 |
| 2007 | 10.6 | 16.16 | 3.68 |
| 2006 | 3.25 | 4.35 | 1.99 |
| 2005 | 2.39 | 3.16 | 1.71 |