| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.37 | 1.6 | 1.29 |
| 2024 | 1.35 | 1.69 | 1.09 |
| 2023 | 2.09 | 2.7 | 1.5 |
| 2022 | 2.27 | 3.44 | 1.64 |
| 2021 | 2.36 | 3.25 | 1.65 |
| 2020 | 1.34 | 2.72 | 0.34 |
| 2019 | 0.44 | 0.57 | 0.36 |
| 2018 | 0.55 | 0.75 | 0.39 |
| 2017 | 0.67 | 0.74 | 0.57 |
| 2016 | 0.61 | 0.76 | 0.49 |
| 2015 | 0.66 | 1.05 | 0.49 |
| 2014 | 0.43 | 0.55 | 0.36 |
| 2013 | 0.48 | 0.66 | 0.36 |
| 2012 | 0.74 | 0.96 | 0.53 |
| 2011 | 1.18 | 1.54 | 0.88 |
| 2010 | 1.3 | 1.64 | 1.07 |
| 2009 | 1.04 | 1.45 | 0.69 |
| 2008 | 1.46 | 2.6 | 0.58 |
| 2007 | 2.2 | 2.98 | 1.5 |
| 2006 | 0.93 | 1.61 | 0.45 |
| 2005 | 0.42 | 0.52 | 0.3 |
| 2004 | 0.42 | 0.56 | 0.32 |