| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.61 | 4.11 | 2.9 |
| 2024 | 2.98 | 4.69 | 2.23 |
| 2023 | 3.35 | 4.47 | 2.6 |
| 2022 | 4.68 | 8.92 | 2.86 |
| 2021 | 4.25 | 10.82 | 2.22 |
| 2020 | 2.74 | 4.59 | 1.86 |
| 2019 | 3.76 | 4.99 | 2.3 |
| 2018 | 3.81 | 5.4 | 2.08 |
| 2017 | 6.35 | 7.96 | 5.07 |
| 2016 | 8.06 | 9.46 | 4.88 |
| 2015 | 5.66 | 9.85 | 3.34 |
| 2014 | 3.39 | 5.29 | 1.79 |
| 2013 | 1.41 | 2.06 | 0.94 |
| 2012 | 1.04 | 1.3 | 0.76 |
| 2011 | 1.77 | 2.59 | 1.01 |
| 2010 | 2.24 | 2.84 | 1.84 |
| 2009 | 1.51 | 2.22 | 0.78 |
| 2008 | 1.33 | 2.63 | 0.57 |
| 2007 | 2.58 | 3.42 | 1.62 |
| 2006 | 1.66 | 2.05 | 1.3 |
| 2005 | 1.48 | 1.91 | 1.08 |
| 2004 | 2.08 | 3.82 | 1.2 |