| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.84 | 7.73 | 6.39 |
| 2024 | 8.56 | 11.59 | 6.87 |
| 2023 | 11.26 | 12.08 | 10.31 |
| 2022 | 12.23 | 14.29 | 10.68 |
| 2021 | 13.6 | 20.95 | 8.5 |
| 2020 | 8.99 | 14.56 | 4.43 |
| 2019 | 4.78 | 5.62 | 4.19 |
| 2018 | 4.88 | 6.12 | 3.94 |
| 2017 | 8.04 | 9.65 | 5.88 |
| 2016 | 8.88 | 12.7 | 7.93 |
| 2015 | 10.37 | 18.9 | 6.07 |
| 2014 | 5.27 | 7.22 | 4.05 |
| 2013 | 4.31 | 5.42 | 3.6 |
| 2012 | 4.05 | 4.97 | 3.64 |
| 2011 | 5.52 | 6.86 | 3.72 |
| 2010 | 7.46 | 9.79 | 5.87 |
| 2009 | 4.89 | 7.15 | 3.31 |
| 2008 | 4.83 | 8.61 | 2.81 |
| 2007 | 6.28 | 9.41 | 3.54 |
| 2006 | 3.83 | 4.55 | 3.18 |
| 2005 | 3.83 | 6.15 | 2.18 |
| 2004 | 3.9 | 6.62 | 2.48 |