| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.05 | 2.15 | 1.94 |
| 2024 | 1.86 | 2.33 | 1.31 |
| 2023 | 1.64 | 2.04 | 1.44 |
| 2022 | 2.01 | 2.54 | 1.7 |
| 2021 | 2.8 | 3.77 | 2.38 |
| 2020 | 2.25 | 3.25 | 1.8 |
| 2019 | 2.37 | 4.31 | 1.57 |
| 2018 | 2.29 | 2.98 | 1.51 |
| 2017 | 2.49 | 2.75 | 2.24 |
| 2016 | 2.18 | 2.63 | 1.56 |
| 2015 | 2.83 | 4.62 | 2.12 |
| 2014 | 1.63 | 2.13 | 1.37 |
| 2013 | 1.63 | 2.15 | 1.1 |
| 2012 | 1.08 | 1.36 | 0.91 |
| 2011 | 2.01 | 3 | 1.01 |
| 2010 | 3.17 | 4.14 | 2.48 |
| 2009 | 2.52 | 3.78 | 1.04 |
| 2008 | 2.27 | 4.03 | 0.76 |
| 2007 | 2.67 | 4.04 | 1.19 |
| 2006 | 1.19 | 1.45 | 1.03 |
| 2005 | 1.69 | 2.8 | 1.07 |
| 2004 | 2.17 | 3.61 | 1.18 |