| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.78 | 2.21 | 1.47 |
| 2024 | 1.77 | 2.43 | 1.27 |
| 2023 | 1.74 | 2.1 | 1.31 |
| 2022 | 1.43 | 1.86 | 1.14 |
| 2021 | 2.26 | 2.96 | 1.82 |
| 2020 | 2.2 | 3.32 | 1.44 |
| 2019 | 1.02 | 1.78 | 0.52 |
| 2018 | 0.96 | 1.38 | 0.53 |
| 2017 | 1.08 | 1.54 | 0.7 |
| 2016 | 1.8 | 2.76 | 1.03 |
| 2015 | 2.62 | 4.52 | 1.66 |
| 2014 | 1.55 | 2.17 | 0.99 |
| 2013 | 1.07 | 1.26 | 0.85 |
| 2012 | 1.11 | 1.46 | 0.78 |
| 2011 | 1.99 | 2.97 | 1.11 |
| 2010 | 3.2 | 4.13 | 2.61 |
| 2009 | 1.78 | 3.18 | 0.84 |
| 2008 | 1.78 | 3.25 | 0.67 |
| 2007 | 2.54 | 3.37 | 1.61 |
| 2006 | 1.45 | 1.82 | 1.16 |
| 2005 | 1.22 | 1.55 | 0.94 |
| 2004 | 1.86 | 3.45 | 1.01 |