| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.51 | 5.01 | 3.79 |
| 2024 | 3.23 | 6.19 | 2.22 |
| 2023 | 2.24 | 3.45 | 1.79 |
| 2022 | 2.34 | 3.88 | 1.74 |
| 2021 | 4.12 | 5.35 | 2.75 |
| 2020 | 3.36 | 4.87 | 1.98 |
| 2019 | 1.81 | 2.34 | 1.18 |
| 2018 | 1.25 | 2.31 | 0.76 |
| 2017 | 2.09 | 4.24 | 1.05 |
| 2016 | 2.9 | 4.45 | 1.78 |
| 2015 | 3.74 | 7.37 | 2 |
| 2014 | 2.89 | 4.22 | 1.97 |
| 2013 | 2.04 | 4.39 | 0.98 |
| 2012 | 1.7 | 2.36 | 0.98 |
| 2011 | 1.73 | 3.02 | 1.03 |
| 2010 | 3.94 | 5.63 | 2.64 |
| 2009 | 2.97 | 5.1 | 0.96 |
| 2008 | 1.29 | 1.9 | 0.84 |
| 2007 | 1.44 | 2.19 | 0.69 |
| 2006 | 0.82 | 1.08 | 0.64 |
| 2005 | 0.91 | 1.14 | 0.66 |
| 2004 | 1.27 | 2.44 | 0.75 |