| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.42 | 6.49 | 4.73 |
| 2024 | 3.69 | 7.18 | 2.5 |
| 2023 | 3.33 | 5.94 | 2.61 |
| 2022 | 2.78 | 3.54 | 2.38 |
| 2021 | 2.42 | 3.08 | 1.81 |
| 2020 | 2.17 | 2.89 | 1.5 |
| 2019 | 1.21 | 3.14 | 0.82 |
| 2018 | 1.32 | 1.98 | 0.81 |
| 2017 | 2.19 | 2.7 | 1.64 |
| 2016 | 2.38 | 3.17 | 1.64 |
| 2015 | 1.92 | 3.99 | 1.07 |
| 2014 | 0.85 | 1.21 | 0.68 |
| 2013 | 0.9 | 1.09 | 0.74 |
| 2012 | 1.04 | 1.34 | 0.86 |
| 2011 | 1.35 | 1.68 | 1.04 |
| 2010 | 1.33 | 1.84 | 0.96 |
| 2009 | 0.94 | 1.22 | 0.48 |
| 2008 | 0.85 | 1.66 | 0.34 |
| 2007 | 1.36 | 2.23 | 0.8 |
| 2006 | 0.82 | 1.34 | 0.49 |
| 2005 | 0.5 | 0.6 | 0.39 |
| 2004 | 0.71 | 1 | 0.48 |