| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.76 | 1.83 | 1.6 |
| 2024 | 1.38 | 1.95 | 1.22 |
| 2023 | 1.78 | 2.24 | 1.36 |
| 2022 | 1.56 | 1.91 | 1.27 |
| 2021 | 1.73 | 2.15 | 1.49 |
| 2020 | 1.3 | 1.66 | 1.1 |
| 2019 | 1.07 | 1.24 | 0.9 |
| 2018 | 1.16 | 1.42 | 0.89 |
| 2017 | 1.56 | 1.79 | 1.3 |
| 2016 | 2.19 | 3.59 | 1.43 |
| 2015 | 2.48 | 3.55 | 1.18 |
| 2014 | 1.16 | 1.38 | 0.97 |
| 2013 | 1.5 | 1.9 | 1.21 |
| 2012 | 1.09 | 1.37 | 0.81 |
| 2011 | 1.32 | 1.88 | 0.84 |
| 2010 | 1.62 | 1.91 | 1.3 |
| 2009 | 1.15 | 1.77 | 0.69 |
| 2008 | 1.24 | 2.87 | 0.5 |
| 2007 | 2.74 | 3.47 | 1.7 |
| 2006 | 1.43 | 1.78 | 1.09 |
| 2005 | 0.76 | 1.54 | 0.55 |
| 2004 | 0.76 | 1.4 | 0.52 |