| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.31 | 1.38 | 1.19 |
| 2024 | 1.3 | 1.5 | 1.1 |
| 2023 | 1.4 | 1.63 | 1.23 |
| 2022 | 1.39 | 1.68 | 1.15 |
| 2021 | 1.78 | 2.31 | 1.38 |
| 2020 | 2.41 | 3.56 | 1.53 |
| 2019 | 1.46 | 1.72 | 1.09 |
| 2018 | 1.56 | 1.95 | 1.15 |
| 2017 | 1.55 | 2.06 | 1.29 |
| 2016 | 1.76 | 2.37 | 1.57 |
| 2015 | 2.85 | 5.41 | 1.51 |
| 2014 | 1.37 | 1.71 | 1.17 |
| 2013 | 1.3 | 1.55 | 1.03 |
| 2012 | 1.47 | 1.87 | 1.03 |
| 2011 | 2.7 | 4.03 | 1.57 |
| 2010 | 3.52 | 4.39 | 2.28 |
| 2009 | 2.67 | 3.99 | 1.78 |
| 2008 | 3.33 | 7.47 | 1.02 |
| 2007 | 4.45 | 7.15 | 1.51 |
| 2006 | 1.69 | 2.04 | 1.38 |
| 2005 | 1.64 | 1.93 | 1.21 |
| 2004 | 1.95 | 3.51 | 1.29 |