| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.34 | 1.4 | 1.23 |
| 2024 | 1.76 | 3.47 | 1.06 |
| 2023 | 1.31 | 3.02 | 0.98 |
| 2022 | 1.12 | 1.66 | 0.96 |
| 2021 | 1.21 | 1.57 | 0.93 |
| 2020 | 1.7 | 2.48 | 1.21 |
| 2019 | 1.13 | 1.46 | 0.87 |
| 2018 | 1.12 | 1.66 | 0.84 |
| 2017 | 1.4 | 1.74 | 1.06 |
| 2016 | 1.14 | 1.34 | 0.94 |
| 2015 | 1.3 | 1.82 | 0.88 |
| 2014 | 0.93 | 1.36 | 0.8 |
| 2013 | 1.31 | 1.84 | 0.95 |
| 2012 | 1.38 | 1.86 | 1.03 |
| 2011 | 2.48 | 3.88 | 1.19 |
| 2010 | 2.94 | 3.63 | 2.05 |
| 2009 | 2.7 | 3.56 | 1.78 |
| 2008 | 2.18 | 4.17 | 0.96 |
| 2007 | 3.19 | 4.78 | 1.35 |
| 2006 | 1.36 | 1.94 | 1.03 |
| 2005 | 1.12 | 1.3 | 0.83 |
| 2004 | 2.38 | 4.97 | 1.23 |