| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.79 | 2.18 | 1.36 |
| 2024 | 1.27 | 2.43 | 0.76 |
| 2023 | 1.11 | 1.3 | 0.97 |
| 2022 | 1.3 | 1.77 | 1.06 |
| 2021 | 1.26 | 1.74 | 1.02 |
| 2020 | 1.34 | 2.39 | 0.62 |
| 2019 | 0.69 | 0.95 | 0.55 |
| 2018 | 0.89 | 1.37 | 0.56 |
| 2017 | 1.58 | 1.88 | 0.95 |
| 2016 | 1.22 | 1.99 | 0.75 |
| 2015 | 1.29 | 1.68 | 0.71 |
| 2014 | 0.64 | 0.88 | 0.51 |
| 2013 | 0.71 | 0.97 | 0.57 |
| 2012 | 0.66 | 1.12 | 0.45 |
| 2011 | 1.05 | 1.46 | 0.6 |
| 2010 | 1.28 | 1.81 | 0.89 |
| 2009 | 1.23 | 1.74 | 0.69 |
| 2008 | 1.4 | 3.22 | 0.51 |
| 2007 | 2.71 | 3.96 | 1.51 |
| 2006 | 1.39 | 1.8 | 1.08 |
| 2005 | 1.62 | 2.09 | 1.19 |
| 2004 | 3.59 | 8.26 | 2 |