| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.25 | 4.93 | 3.73 |
| 2023 | 4.27 | 4.66 | 3.52 |
| 2022 | 4.84 | 6.33 | 4.05 |
| 2021 | 4.83 | 7.08 | 3.73 |
| 2020 | 3.24 | 3.89 | 2.69 |
| 2019 | 3.39 | 4.15 | 2.86 |
| 2018 | 4.79 | 8.81 | 2.86 |
| 2017 | 4.87 | 8.55 | 4.44 |
| 2016 | 4.59 | 6.07 | 3.88 |
| 2015 | 6.4 | 9.94 | 4.37 |
| 2014 | 6.54 | 11 | 4.93 |
| 2013 | 7.88 | 9.52 | 5.93 |
| 2012 | 9.6 | 14.07 | 6.45 |
| 2011 | 16.92 | 30.45 | 13.04 |
| 2010 | 21.25 | 33.57 | 11.89 |
| 2009 | 8.67 | 12.97 | 5.65 |
| 2008 | 6.45 | 10.85 | 4.24 |
| 2007 | 8.35 | 11.48 | 6.14 |
| 2006 | 6.36 | 8.82 | 4.51 |
| 2005 | 4.15 | 4.98 | 3.32 |
| 2004 | 4.23 | 5.14 | 3.1 |