| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.26 | 2.81 | 1.91 |
| 2024 | 1.76 | 2.75 | 1.3 |
| 2023 | 2.37 | 3.05 | 1.89 |
| 2022 | 2.52 | 4.5 | 1.81 |
| 2021 | 3.12 | 3.65 | 2.65 |
| 2020 | 4.36 | 5.65 | 3.48 |
| 2019 | 5.76 | 8.31 | 3.97 |
| 2018 | 4.45 | 5.8 | 2.94 |
| 2017 | 4.75 | 6.33 | 3.81 |
| 2016 | 8.05 | 11.7 | 6.17 |
| 2015 | 6.68 | 13.46 | 3.87 |
| 2014 | 6.22 | 9.03 | 3.78 |
| 2013 | 4.02 | 6.07 | 2.54 |
| 2012 | 4.07 | 4.87 | 3.4 |
| 2011 | 5.64 | 7.58 | 3.85 |
| 2010 | 6.71 | 8.79 | 4.99 |
| 2009 | 5.15 | 7.9 | 1.44 |
| 2008 | 2.31 | 4.94 | 1.04 |
| 2007 | 3.39 | 4.92 | 1.83 |
| 2006 | 2.45 | 3.51 | 1.74 |
| 2005 | 2.56 | 3.52 | 1.58 |
| 2004 | 2.74 | 4 | 1.49 |