| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.37 | 6.78 | 5.71 |
| 2024 | 5.72 | 8.67 | 4.44 |
| 2023 | 4.84 | 6.23 | 3.82 |
| 2022 | 4.06 | 4.73 | 3.38 |
| 2021 | 5.28 | 7.22 | 4.4 |
| 2020 | 7.09 | 9.36 | 5.46 |
| 2019 | 23.21 | 45.25 | 6.23 |
| 2018 | 17.81 | 36 | 9.55 |
| 2017 | 9.67 | 13.1 | 7.94 |
| 2016 | 8.06 | 9.89 | 6 |
| 2015 | 15.61 | 25.33 | 6.65 |
| 2014 | 14.9 | 27.46 | 12.15 |
| 2013 | 17.48 | 22.83 | 11.06 |
| 2012 | 12.3 | 18.62 | 6.8 |
| 2011 | 12.86 | 88.78 | 5.35 |
| 2010 | 5.7 | 8.79 | 5.35 |
| 2009 | 9.07 | 10.21 | 6.36 |
| 2008 | 4.58 | 6.36 | 3.82 |
| 2007 | 4.01 | 4.18 | 3.67 |
| 2006 | 3.02 | 3.81 | 1.85 |
| 2005 | 2.22 | 3.04 | 1.39 |
| 2004 | 2.98 | 5.85 | 1.64 |