| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.15 | 7.64 | 3.5 |
| 2024 | 3.55 | 4.58 | 2.6 |
| 2023 | 2.55 | 3.79 | 1.75 |
| 2022 | 2.25 | 3.16 | 1.37 |
| 2021 | 2.1 | 3.09 | 1.69 |
| 2020 | 2.46 | 3.88 | 1.83 |
| 2019 | 1.74 | 2.6 | 1.41 |
| 2018 | 2.27 | 2.93 | 1.48 |
| 2017 | 3.4 | 4.68 | 2.72 |
| 2016 | 3.88 | 4.56 | 2.79 |
| 2015 | 4.32 | 6.55 | 2.66 |
| 2014 | 3.88 | 5.66 | 2.65 |
| 2013 | 3.2 | 4.34 | 2.39 |
| 2012 | 2.92 | 3.98 | 2.05 |
| 2011 | 4.26 | 6.22 | 2.8 |
| 2010 | 3.29 | 4.64 | 2.47 |
| 2009 | 2.12 | 2.79 | 1.43 |
| 2008 | 2.22 | 4.01 | 1.16 |
| 2007 | 2.7 | 3.72 | 1.51 |
| 2006 | 1.59 | 2.02 | 1.3 |
| 2005 | 1.79 | 2.41 | 1.27 |