| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.97 | 4.29 | 3.57 |
| 2024 | 3.72 | 5.64 | 2.49 |
| 2023 | 4.25 | 5.68 | 3.19 |
| 2022 | 4.16 | 5.57 | 3.04 |
| 2021 | 2.82 | 4.07 | 1.95 |
| 2020 | 2.65 | 3.44 | 2.13 |
| 2019 | 2.75 | 3.75 | 2.29 |
| 2018 | 2.94 | 4.61 | 2.12 |
| 2017 | 4.73 | 6.79 | 3.26 |
| 2016 | 4.92 | 6.56 | 3.86 |
| 2015 | 5.6 | 9.67 | 3.72 |
| 2014 | 2.7 | 5.5 | 1.55 |
| 2013 | 1.77 | 2.05 | 1.43 |
| 2012 | 2.07 | 2.52 | 1.53 |
| 2011 | 2.98 | 4.12 | 2.09 |
| 2010 | 2.66 | 3.35 | 1.75 |
| 2009 | 2.31 | 2.9 | 1.58 |
| 2008 | 5.05 | 9.78 | 1.27 |
| 2007 | 5.59 | 8.76 | 2.28 |
| 2006 | 1.83 | 2.47 | 1.32 |
| 2005 | 1.5 | 1.84 | 1.29 |