| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.37 | 1.54 | 1.22 |
| 2025 | 1.41 | 1.55 | 1.26 |
| 2024 | 1.28 | 1.74 | 1 |
| 2023 | 1.71 | 2.22 | 1.31 |
| 2022 | 1.37 | 2.01 | 0.98 |
| 2021 | 2.18 | 3.49 | 1.48 |
| 2020 | 2.89 | 3.49 | 2.37 |
| 2019 | 2.5 | 3.15 | 1.42 |
| 2018 | 1.54 | 2.27 | 0.85 |
| 2017 | 1.03 | 1.2 | 0.92 |
| 2016 | 1.2 | 1.42 | 1.05 |
| 2015 | 1.25 | 1.8 | 0.86 |
| 2014 | 0.84 | 1.18 | 0.65 |
| 2013 | 0.73 | 0.89 | 0.55 |
| 2012 | 0.8 | 1.07 | 0.48 |
| 2011 | 1.22 | 1.58 | 0.86 |
| 2010 | 1.37 | 1.9 | 1.04 |
| 2009 | 1.17 | 1.51 | 0.96 |
| 2008 | 1.31 | 2.27 | 0.64 |
| 2007 | 1.56 | 2.19 | 0.99 |
| 2006 | 0.66 | 1.03 | 0.48 |
| 2005 | 0.61 | 0.82 | 0.45 |
| 2004 | 1.12 | 1.86 | 0.58 |