| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.51 | 4.37 | 2.64 |
| 2023 | 3.14 | 3.82 | 2.63 |
| 2022 | 2.83 | 3.57 | 2.42 |
| 2021 | 3.23 | 4.44 | 2.47 |
| 2020 | 4.87 | 6.34 | 4.04 |
| 2019 | 3.94 | 5.72 | 2.91 |
| 2018 | 3.01 | 3.87 | 2.38 |
| 2017 | 4.39 | 7.02 | 3.22 |
| 2016 | 5.31 | 8.35 | 2.51 |
| 2015 | 3.64 | 5.29 | 2.46 |
| 2014 | 2.78 | 3.35 | 2.53 |
| 2013 | 4.93 | 7.56 | 2.86 |
| 2012 | 8.01 | 9.82 | 6.83 |
| 2011 | 14.81 | 20.91 | 7.3 |
| 2010 | 19.11 | 27.37 | 14.5 |
| 2009 | 15.03 | 23.63 | 7.11 |
| 2008 | 18.06 | 53.21 | 4.47 |
| 2007 | 20.96 | 44.43 | 7.11 |
| 2006 | 6.33 | 10.81 | 3.67 |
| 2005 | 2.89 | 3.76 | 1.98 |
| 2004 | 3.92 | 4.97 | 3.43 |