| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.67 | 5.91 | 3.25 |
| 2024 | 3.47 | 5.66 | 2.28 |
| 2023 | 3.97 | 7.84 | 2.53 |
| 2022 | 2.65 | 3.24 | 2.09 |
| 2021 | 2.63 | 4.2 | 2.03 |
| 2020 | 2.29 | 2.84 | 1.5 |
| 2019 | 1.16 | 1.78 | 0.8 |
| 2018 | 1.28 | 1.79 | 0.98 |
| 2017 | 2.43 | 3.18 | 1.74 |
| 2016 | 3.24 | 4.19 | 2.78 |
| 2015 | 4.46 | 5.72 | 2.34 |
| 2014 | 1.57 | 2.49 | 1.07 |
| 2013 | 1.26 | 1.37 | 1.04 |
| 2012 | 1.19 | 1.48 | 0.89 |
| 2011 | 1.94 | 2.85 | 1.18 |
| 2010 | 2.37 | 3.13 | 1.8 |
| 2009 | 1.94 | 3.14 | 1.2 |
| 2008 | 2.11 | 3.75 | 0.96 |
| 2007 | 2.97 | 4.88 | 1.79 |
| 2006 | 1.81 | 2.34 | 1.31 |
| 2005 | 1.62 | 2.22 | 1.01 |
| 2004 | 1.92 | 3.02 | 1.09 |