| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.57 | 6.95 | 5.05 |
| 2024 | 4.68 | 6.17 | 3.86 |
| 2023 | 4.71 | 5.28 | 4.15 |
| 2022 | 4.76 | 5.87 | 3.85 |
| 2021 | 4.83 | 6.72 | 4.16 |
| 2020 | 5.97 | 8.55 | 3.6 |
| 2019 | 3.84 | 5.99 | 2.34 |
| 2018 | 2.39 | 3.26 | 1.45 |
| 2017 | 2.04 | 3.27 | 1.47 |
| 2016 | 4.73 | 6.35 | 2.65 |
| 2015 | 7.28 | 11.86 | 4.8 |
| 2014 | 3.37 | 5.73 | 2.43 |
| 2013 | 2.3 | 3.74 | 1.32 |
| 2012 | 1.33 | 1.93 | 0.99 |
| 2011 | 2.08 | 3.1 | 0.95 |
| 2010 | 2.8 | 4.34 | 1.72 |
| 2009 | 2.94 | 5.12 | 2.17 |
| 2008 | 3.75 | 8 | 1.79 |
| 2007 | 2.82 | 4.36 | 1.18 |
| 2006 | 1.38 | 1.92 | 1.1 |
| 2005 | 1.21 | 1.73 | 0.89 |
| 2004 | 1.78 | 3.1 | 1.2 |