| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.02 | 3.39 | 2.79 |
| 2024 | 2.97 | 4 | 2.37 |
| 2023 | 2.71 | 3.34 | 2.07 |
| 2022 | 2.51 | 3.82 | 1.69 |
| 2021 | 2.25 | 3.92 | 1.42 |
| 2020 | 7.76 | 22.77 | 1.49 |
| 2019 | 7.41 | 19.58 | 2.9 |
| 2018 | 3.92 | 5.7 | 2.9 |
| 2017 | 4.26 | 5.23 | 3.37 |
| 2016 | 4.97 | 6.38 | 3.35 |
| 2015 | 5.24 | 9.56 | 3.77 |
| 2014 | 3.08 | 4.71 | 2.18 |
| 2013 | 3.12 | 4.59 | 2.45 |
| 2012 | 4.28 | 5.35 | 2.91 |
| 2011 | 7.4 | 9.93 | 3.98 |
| 2010 | 7.37 | 10.05 | 5.13 |
| 2009 | 8.19 | 11.75 | 3.29 |
| 2008 | 4.43 | 8.38 | 1.94 |
| 2007 | 6.13 | 9.3 | 3.2 |
| 2006 | 3.36 | 4.22 | 2.9 |
| 2005 | 3.72 | 4.66 | 2.76 |
| 2004 | 6.05 | 9.95 | 3.99 |