| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.28 | 1.37 | 1.21 |
| 2024 | 1.15 | 1.36 | 0.99 |
| 2023 | 0.94 | 1.08 | 0.84 |
| 2022 | 0.85 | 0.93 | 0.79 |
| 2021 | 0.97 | 1.09 | 0.87 |
| 2020 | 1.16 | 1.46 | 1.01 |
| 2019 | 1.64 | 2.03 | 1.4 |
| 2018 | 1.61 | 2.02 | 1.4 |
| 2017 | 1.85 | 2.05 | 1.67 |
| 2016 | 1.84 | 2.15 | 1.71 |
| 2015 | 2.23 | 2.94 | 1.62 |
| 2014 | 1.64 | 2.31 | 1.46 |
| 2013 | 1.71 | 2.2 | 1.34 |
| 2012 | 1.94 | 2.67 | 1.45 |
| 2011 | 2.62 | 3.74 | 2.22 |
| 2010 | 3.16 | 4.74 | 2.23 |
| 2009 | 3.92 | 4.86 | 2.51 |
| 2008 | 4.16 | 9.14 | 2.16 |
| 2007 | 7.01 | 10.27 | 4.16 |
| 2006 | 3.45 | 4.48 | 2.51 |
| 2005 | 3.39 | 3.96 | 2.95 |
| 2004 | 4.59 | 6.83 | 3.66 |