| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.31 | 7.16 | 5.46 |
| 2024 | 5.28 | 6.96 | 3.96 |
| 2023 | 5.48 | 6.32 | 5.02 |
| 2022 | 6.05 | 8.89 | 4.72 |
| 2021 | 6.89 | 8.75 | 5.66 |
| 2020 | 7.86 | 11.85 | 5.31 |
| 2019 | 6.21 | 8.42 | 4.88 |
| 2018 | 8.96 | 12.14 | 5.82 |
| 2017 | 11.68 | 13.48 | 8.68 |
| 2016 | 19.34 | 33.88 | 13.48 |
| 2015 | 48.96 | 76.55 | 27.21 |
| 2014 | 27.25 | 41.7 | 20.81 |
| 2013 | 28.36 | 38.92 | 20.41 |
| 2012 | 28.44 | 37.71 | 17.94 |
| 2011 | 24.33 | 34 | 10.09 |
| 2010 | 9.85 | 14.44 | 7.82 |
| 2009 | 7.63 | 10.37 | 4.53 |
| 2008 | 5.01 | 7.47 | 3.62 |
| 2007 | 5.29 | 7.68 | 2.11 |
| 2006 | 2.15 | 2.74 | 1.53 |
| 2005 | 2.19 | 2.99 | 1.24 |
| 2004 | 4.16 | 10.05 | 1.77 |