| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.87 | 1.03 | 0.66 |
| 2024 | 0.68 | 0.94 | 0.56 |
| 2023 | 0.87 | 1.02 | 0.7 |
| 2022 | 1.12 | 1.76 | 0.8 |
| 2021 | 1.57 | 2.04 | 1.09 |
| 2020 | 1.39 | 1.86 | 1.06 |
| 2019 | 2.04 | 2.77 | 1.64 |
| 2018 | 3.61 | 5.32 | 1.75 |
| 2017 | 4.8 | 5.67 | 4.26 |
| 2016 | 10.33 | 33.29 | 4.72 |
| 2015 | 7.61 | 39.02 | 2.36 |
| 2014 | 2.66 | 3.26 | 2.21 |
| 2013 | 2.57 | 2.97 | 2.21 |
| 2012 | 2.46 | 2.83 | 2.01 |
| 2011 | 3.5 | 4.95 | 2.1 |
| 2010 | 4.03 | 5.26 | 2.83 |
| 2009 | 3.21 | 4.75 | 1.6 |
| 2008 | 3.27 | 7.99 | 1.15 |
| 2007 | 5.53 | 7.12 | 3.22 |
| 2006 | 2.49 | 3.43 | 2.09 |
| 2005 | 2.47 | 2.87 | 1.99 |