| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.74 | 1.86 | 1.57 |
| 2024 | 2.13 | 2.51 | 1.78 |
| 2023 | 1.97 | 2.67 | 1.56 |
| 2022 | 1.61 | 2.02 | 1.12 |
| 2021 | 1.63 | 2.26 | 1.2 |
| 2020 | 2.49 | 3.67 | 1.09 |
| 2019 | 1.54 | 2.56 | 1.09 |
| 2018 | 1.3 | 2.08 | 0.82 |
| 2017 | 1.78 | 2.08 | 1.51 |
| 2016 | 1.25 | 1.77 | 0.98 |
| 2015 | 2.05 | 3.28 | 1.46 |
| 2014 | 1.46 | 2.17 | 1.07 |
| 2013 | 1.21 | 1.63 | 0.96 |
| 2012 | 1.09 | 1.45 | 0.88 |
| 2011 | 1.48 | 2.1 | 0.91 |
| 2010 | 1.62 | 1.89 | 1.39 |
| 2009 | 1.61 | 2.28 | 1.12 |
| 2008 | 3.92 | 14.19 | 0.78 |
| 2007 | 16.84 | 75.61 | 3.78 |
| 2006 | 2.68 | 4.17 | 1.51 |
| 2005 | 1.66 | 2.11 | 0.98 |
| 2004 | 1.44 | 2.32 | 0.96 |