| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.35 | 2.48 | 2.19 |
| 2024 | 2.56 | 3.46 | 2.07 |
| 2023 | 3.38 | 3.97 | 2.8 |
| 2022 | 3.41 | 5.26 | 2.59 |
| 2021 | 4.1 | 5.76 | 3.27 |
| 2020 | 4.42 | 5.67 | 3.58 |
| 2019 | 4.13 | 5.46 | 3.5 |
| 2018 | 5.22 | 7.52 | 3.67 |
| 2017 | 7.52 | 11.56 | 5.18 |
| 2016 | 10.93 | 14.07 | 6.89 |
| 2015 | 10.73 | 18.46 | 6.57 |
| 2014 | 5.72 | 7.51 | 4.52 |
| 2013 | 6.2 | 8.02 | 4.32 |
| 2012 | 5.51 | 7.54 | 3.65 |
| 2011 | 10.37 | 14.31 | 5.81 |
| 2010 | 9.23 | 17.5 | 4.77 |
| 2009 | 4.68 | 6.13 | 3.37 |
| 2008 | 7.02 | 15.44 | 1.81 |
| 2007 | 13.09 | 19.99 | 9.52 |
| 2006 | 5.71 | 10.28 | 3.11 |
| 2005 | 3.72 | 5.08 | 1.8 |
| 2004 | 3.97 | 7.8 | 2.04 |