| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.72 | 4.2 | 3.32 |
| 2023 | 3.85 | 4.27 | 3.21 |
| 2022 | 4.26 | 5.4 | 3.46 |
| 2021 | 4.21 | 6.04 | 3.25 |
| 2020 | 3.06 | 3.61 | 2.64 |
| 2019 | 3.08 | 3.91 | 2.43 |
| 2018 | 3.62 | 6.63 | 2.29 |
| 2017 | 3.59 | 6.43 | 3.32 |
| 2016 | 3.61 | 5.19 | 3.1 |
| 2015 | 5.04 | 8.42 | 3.29 |
| 2014 | 4.07 | 7.21 | 3.05 |
| 2013 | 4.97 | 5.97 | 3.82 |
| 2012 | 5.95 | 9.54 | 4.05 |
| 2011 | 13.48 | 17.29 | 8.84 |
| 2010 | 11.89 | 19.06 | 7.02 |
| 2009 | 6.77 | 8.94 | 4.62 |
| 2008 | 5.22 | 8.89 | 3.47 |
| 2007 | 7.36 | 10.44 | 5.65 |
| 2006 | 6.1 | 8.37 | 4.41 |
| 2005 | 4.84 | 6.39 | 3.14 |
| 2004 | 5.2 | 8.37 | 2.93 |