| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.67 | 2.46 | 1.19 |
| 2024 | 1.27 | 1.68 | 0.91 |
| 2023 | 1.63 | 1.84 | 1.42 |
| 2022 | 1.7 | 2.22 | 1.42 |
| 2021 | 1.72 | 1.94 | 1.46 |
| 2020 | 2.01 | 2.56 | 1.8 |
| 2019 | 1.8 | 2.69 | 1.41 |
| 2018 | 1.73 | 2.5 | 1.1 |
| 2017 | 3.27 | 4.75 | 2.39 |
| 2016 | 3.72 | 5.27 | 2.27 |
| 2015 | 2.54 | 4.69 | 1.86 |
| 2014 | 1.64 | 2.22 | 1.32 |
| 2013 | 1.46 | 1.72 | 1.24 |
| 2012 | 1.6 | 2.15 | 1.22 |
| 2011 | 2.5 | 3.33 | 1.48 |
| 2010 | 2.7 | 3.44 | 2.24 |
| 2009 | 1.86 | 3.06 | 0.71 |
| 2008 | 1 | 1.79 | 0.53 |
| 2007 | 1.52 | 2.1 | 0.9 |
| 2006 | 0.94 | 1.18 | 0.81 |
| 2005 | 1.17 | 1.75 | 0.78 |
| 2004 | 1.5 | 1.96 | 1.14 |