| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.34 | 1.47 | 1.16 |
| 2024 | 1.21 | 1.62 | 1.05 |
| 2023 | 1.48 | 1.69 | 1.27 |
| 2022 | 1.55 | 2.06 | 1.27 |
| 2021 | 1.53 | 1.91 | 1.25 |
| 2020 | 1.59 | 1.93 | 1.36 |
| 2019 | 1.67 | 1.91 | 1.49 |
| 2018 | 1.72 | 2.08 | 1.48 |
| 2017 | 2.09 | 2.45 | 1.79 |
| 2016 | 2.07 | 2.35 | 1.68 |
| 2015 | 4.18 | 10.71 | 1.82 |
| 2014 | 4.49 | 5.32 | 3.46 |
| 2013 | 3.47 | 5.95 | 2.51 |
| 2012 | 2.84 | 4.07 | 2.22 |
| 2011 | 3.75 | 4.86 | 2.51 |
| 2010 | 5.02 | 8.7 | 2.86 |
| 2009 | 5.86 | 8.92 | 4.36 |
| 2008 | 4.91 | 7.57 | 2.39 |
| 2007 | 5.14 | 8.57 | 2.37 |
| 2006 | 2.28 | 2.71 | 1.76 |
| 2005 | 1.95 | 2.43 | 1.51 |
| 2004 | 3.14 | 4.52 | 2.22 |