| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.71 | 1.97 | 1.51 |
| 2024 | 1.44 | 2.48 | 1.01 |
| 2023 | 1.69 | 2.5 | 1.14 |
| 2022 | 1.12 | 1.64 | 0.72 |
| 2021 | 1.01 | 1.6 | 0.53 |
| 2020 | 0.33 | 0.63 | 0.2 |
| 2019 | 0.53 | 0.74 | 0.39 |
| 2018 | 0.97 | 1.38 | 0.46 |
| 2017 | 1.33 | 1.57 | 1.08 |
| 2016 | 1.28 | 1.88 | 1.07 |
| 2015 | 1.92 | 3.53 | 1.06 |
| 2014 | 0.89 | 1.24 | 0.66 |
| 2013 | 1.03 | 1.49 | 0.7 |
| 2012 | 0.68 | 0.81 | 0.55 |
| 2011 | 0.71 | 0.85 | 0.61 |
| 2010 | 0.83 | 1.02 | 0.62 |
| 2009 | 0.54 | 0.89 | 0.23 |
| 2008 | 0.56 | 1.14 | 0.17 |
| 2007 | 0.82 | 1.01 | 0.52 |
| 2006 | 0.5 | 0.67 | 0.38 |
| 2005 | 0.41 | 0.52 | 0.28 |
| 2004 | 0.37 | 0.56 | 0.22 |