| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.88 | 2.01 | 1.78 |
| 2024 | 2.08 | 2.46 | 1.71 |
| 2023 | 1.75 | 2.06 | 1.6 |
| 2022 | 1.74 | 1.92 | 1.6 |
| 2021 | 1.66 | 2.08 | 1.42 |
| 2020 | 1.39 | 1.7 | 1.17 |
| 2019 | 1.4 | 1.61 | 1.18 |
| 2018 | 1.47 | 1.64 | 1.28 |
| 2017 | 1.7 | 1.88 | 1.56 |
| 2016 | 1.49 | 1.69 | 1.28 |
| 2015 | 2.38 | 3.1 | 1.78 |
| 2014 | 1.28 | 2.32 | 0.99 |
| 2013 | 0.98 | 1.19 | 0.82 |
| 2012 | 0.7 | 0.86 | 0.61 |
| 2011 | 0.77 | 1.02 | 0.61 |
| 2010 | 1.56 | 3.18 | 0.75 |
| 2009 | 1.78 | 3.32 | 1.4 |
| 2008 | 1.51 | 2.8 | 1.02 |
| 2007 | 2.67 | 3.37 | 1.89 |
| 2006 | 1.29 | 1.98 | 0.97 |
| 2005 | 1.39 | 1.86 | 0.91 |
| 2004 | 2.58 | 4.18 | 1.05 |