| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.77 | 5.68 | 3.43 |
| 2024 | 4.91 | 8.01 | 3.26 |
| 2023 | 5.35 | 7.68 | 3.41 |
| 2022 | 3.81 | 6.04 | 2.75 |
| 2021 | 6.26 | 12.51 | 2.64 |
| 2020 | 15.26 | 19.84 | 10.23 |
| 2019 | 15.59 | 20.25 | 11.83 |
| 2018 | 10.25 | 14.61 | 7.12 |
| 2017 | 8.48 | 11.19 | 6.87 |
| 2016 | 7.42 | 11.26 | 3.65 |
| 2015 | 3.75 | 5.01 | 1.98 |
| 2014 | 4.96 | 6.23 | 3.06 |
| 2013 | 6.39 | 7.39 | 5.44 |
| 2012 | 5.1 | 6.74 | 3.76 |
| 2011 | 2.79 | 5.38 | 1.6 |
| 2010 | 3.64 | 7.44 | 1.79 |
| 2009 | 4.31 | 7.92 | 1.12 |
| 2008 | 2.59 | 6.26 | 0.79 |
| 2007 | 6.16 | 11.4 | 2.76 |
| 2006 | 1.86 | 3.82 | 0.84 |
| 2005 | 1.49 | 3.15 | 0.89 |
| 2004 | 3.25 | 5.17 | 2.16 |