| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.77 | 3.27 | 2.48 |
| 2024 | 3.33 | 4.57 | 2.6 |
| 2023 | 4.31 | 5.06 | 3.55 |
| 2022 | 3.88 | 5.55 | 2.95 |
| 2021 | 4.19 | 4.99 | 3.11 |
| 2020 | 5.21 | 7.56 | 3.78 |
| 2019 | 3.29 | 4.35 | 2.28 |
| 2018 | 4.46 | 7.09 | 2.37 |
| 2017 | 5.91 | 7.9 | 4.41 |
| 2016 | 6.63 | 9.68 | 4.87 |
| 2015 | 6.93 | 10.47 | 4.15 |
| 2014 | 9.23 | 20.05 | 6 |
| 2013 | 3.91 | 7.02 | 2.28 |
| 2012 | 3.26 | 6.12 | 1.96 |
| 2011 | 8.45 | 13.03 | 3.59 |
| 2010 | 9.71 | 14.83 | 6.22 |
| 2009 | 5.79 | 11.21 | 2.6 |
| 2008 | 4.74 | 14.11 | 1.47 |
| 2007 | 10.28 | 17.95 | 2.03 |
| 2006 | 2.02 | 2.61 | 1.52 |
| 2005 | 3.46 | 5.49 | 2.25 |