| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.37 | 5.03 | 3.81 |
| 2023 | 6.21 | 8.09 | 4.72 |
| 2022 | 7.09 | 9.25 | 5.06 |
| 2021 | 10.57 | 17.51 | 7.32 |
| 2020 | 13.54 | 19.36 | 8.34 |
| 2019 | 12.48 | 15.32 | 8.76 |
| 2018 | 13.71 | 22.31 | 7.34 |
| 2017 | 17.16 | 23.51 | 12.56 |
| 2016 | 21.06 | 26.1 | 16.4 |
| 2015 | 25.7 | 48.6 | 13.66 |
| 2014 | 12.03 | 15.28 | 8.51 |
| 2013 | 6.29 | 10.91 | 4.37 |
| 2012 | 6.25 | 8.19 | 4.18 |
| 2011 | 7.96 | 10.05 | 5.07 |
| 2010 | 10.1 | 12.72 | 7.52 |
| 2009 | 7.99 | 11.14 | 3.89 |
| 2008 | 7.24 | 13.04 | 3.17 |
| 2007 | 8.74 | 12.31 | 4.82 |
| 2006 | 5.15 | 5.92 | 4.68 |
| 2005 | 5.17 | 7.11 | 3.78 |
| 2004 | 6.77 | 10.66 | 4.02 |