| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.72 | 7.23 | 4.79 |
| 2024 | 4.31 | 5.94 | 3.3 |
| 2023 | 5.12 | 8.48 | 3.91 |
| 2022 | 4.37 | 5.89 | 3.34 |
| 2021 | 6.85 | 8.8 | 5.38 |
| 2020 | 6.6 | 11.09 | 4.28 |
| 2019 | 5.99 | 7.4 | 4.99 |
| 2018 | 4.18 | 5.83 | 2.66 |
| 2017 | 4.14 | 6.13 | 3.02 |
| 2016 | 6.97 | 13.18 | 4.65 |
| 2015 | 15.78 | 27.28 | 7.56 |
| 2014 | 4.56 | 8.96 | 3.55 |
| 2013 | 4.6 | 5.81 | 3.67 |
| 2012 | 5.87 | 7.54 | 4.39 |
| 2011 | 9.77 | 13.85 | 5.53 |
| 2010 | 9.19 | 12.34 | 6.39 |
| 2009 | 8.49 | 11.44 | 4.78 |
| 2008 | 4.53 | 7.37 | 3.06 |
| 2007 | 5.76 | 7.81 | 4.4 |
| 2006 | 4.26 | 5.31 | 2.9 |
| 2005 | 2.58 | 3.28 | 1.58 |
| 2004 | 1.83 | 2.89 | 1.45 |