| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.28 | 1.5 | 1.12 |
| 2024 | 1.36 | 2.23 | 1 |
| 2023 | 1.94 | 2.36 | 1.68 |
| 2022 | 1.88 | 2.37 | 1.63 |
| 2021 | 1.74 | 2.09 | 1.5 |
| 2020 | 1.99 | 2.48 | 1.71 |
| 2019 | 2.3 | 3.18 | 1.89 |
| 2018 | 2.51 | 3.42 | 1.64 |
| 2017 | 4.6 | 6.99 | 3.02 |
| 2016 | 6.09 | 7.62 | 4.24 |
| 2015 | 5.79 | 11.37 | 3.14 |
| 2014 | 2.94 | 4.25 | 2.05 |
| 2013 | 1.95 | 2.28 | 1.6 |
| 2012 | 2.25 | 3.12 | 1.72 |
| 2011 | 3.15 | 3.94 | 2.18 |
| 2010 | 2.66 | 3.06 | 2.12 |
| 2009 | 1.86 | 2.91 | 1.05 |
| 2008 | 1.69 | 3.08 | 0.82 |
| 2007 | 2.22 | 3.35 | 1.2 |
| 2006 | 1.18 | 1.37 | 1.04 |
| 2005 | 1.26 | 1.49 | 1.01 |