| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.93 | 3.36 | 2.59 |
| 2024 | 1.95 | 3.68 | 1.02 |
| 2023 | 1.52 | 2.03 | 1.17 |
| 2022 | 1.22 | 1.44 | 0.81 |
| 2021 | 1.07 | 1.38 | 0.88 |
| 2020 | 1.36 | 1.82 | 1.12 |
| 2019 | 1.35 | 1.81 | 0.95 |
| 2018 | 1.26 | 1.74 | 0.93 |
| 2017 | 2.37 | 3.84 | 1.56 |
| 2016 | 2.68 | 3.39 | 1.99 |
| 2015 | 2.41 | 4.19 | 1.43 |
| 2014 | 1.2 | 1.77 | 0.8 |
| 2013 | 0.78 | 1.04 | 0.64 |
| 2012 | 0.94 | 1.33 | 0.67 |
| 2011 | 1.65 | 2.32 | 1.04 |
| 2010 | 1.83 | 2.66 | 1.31 |
| 2009 | 1.53 | 2.03 | 0.86 |
| 2008 | 2.12 | 5 | 0.67 |
| 2007 | 4.56 | 7.02 | 2.85 |
| 2006 | 2.7 | 3.78 | 1.62 |
| 2005 | 1.39 | 1.78 | 0.95 |
| 2004 | 1.61 | 2.37 | 1.13 |