| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.05 | 5.89 | 1.78 |
| 2024 | 1.95 | 2.76 | 1.56 |
| 2023 | 2.15 | 3.13 | 1.84 |
| 2022 | 2.22 | 2.92 | 1.68 |
| 2021 | 3.1 | 4.05 | 2.33 |
| 2020 | 5.25 | 7.79 | 3.5 |
| 2019 | 4.88 | 8.04 | 2.07 |
| 2018 | 3.03 | 4.85 | 1.83 |
| 2017 | 7.63 | 14.2 | 4.36 |
| 2016 | 7.51 | 10.86 | 5.47 |
| 2015 | 8.26 | 15.72 | 4.92 |
| 2014 | 5.16 | 6.85 | 3.93 |
| 2013 | 4.05 | 5.27 | 2.77 |
| 2012 | 2.81 | 3.38 | 2.27 |
| 2011 | 4.61 | 7.25 | 2.58 |
| 2010 | 6.59 | 9.44 | 5.04 |
| 2009 | 4.95 | 8.34 | 2.33 |
| 2008 | 3.84 | 6.47 | 1.61 |
| 2007 | 5.29 | 6.73 | 4.02 |
| 2006 | 3.3 | 4.39 | 2.5 |
| 2005 | 2.99 | 3.74 | 1.46 |
| 2004 | 2.44 | 4.5 | 1.64 |