| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.16 | 2.86 | 1.54 |
| 2023 | 2.39 | 2.8 | 1.78 |
| 2022 | 1.93 | 2.59 | 1.51 |
| 2021 | 2.21 | 2.51 | 1.96 |
| 2020 | 2.85 | 3.71 | 2.3 |
| 2019 | 2.96 | 3.63 | 2.55 |
| 2018 | 3.32 | 4.52 | 2.44 |
| 2017 | 4.87 | 5.79 | 3.82 |
| 2016 | 5.51 | 7.6 | 4.94 |
| 2015 | 8.94 | 16.79 | 5.43 |
| 2014 | 5.84 | 9.25 | 3.87 |
| 2013 | 5.08 | 6.23 | 3.32 |
| 2012 | 5.16 | 7.05 | 2.8 |
| 2011 | 8.4 | 10.91 | 5.9 |
| 2010 | 6.98 | 13.53 | 4.36 |
| 2009 | 3.92 | 7.08 | 1.46 |
| 2008 | 4.37 | 11.53 | 1.13 |
| 2007 | 7.19 | 10.38 | 4.48 |
| 2006 | 6.1 | 8.55 | 4.24 |
| 2005 | 5.23 | 7.62 | 3.6 |
| 2004 | 4.23 | 6.72 | 3.09 |