| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.01 | 3.49 | 2.74 |
| 2024 | 3.01 | 3.56 | 2.27 |
| 2023 | 3.99 | 5.47 | 2.74 |
| 2022 | 4.29 | 4.99 | 3.33 |
| 2021 | 4.33 | 5.44 | 3.52 |
| 2020 | 3.33 | 5.33 | 1.83 |
| 2019 | 2.29 | 2.69 | 1.68 |
| 2018 | 2.02 | 2.88 | 1.47 |
| 2017 | 1.68 | 2.09 | 1.5 |
| 2016 | 1.48 | 1.67 | 1.3 |
| 2015 | 1.86 | 2.69 | 1.38 |
| 2014 | 1.87 | 2.29 | 1.67 |
| 2013 | 2.02 | 2.42 | 1.68 |
| 2012 | 1.92 | 2.33 | 1.53 |
| 2011 | 2.19 | 2.5 | 1.9 |
| 2010 | 2.58 | 2.95 | 2.25 |
| 2009 | 2.13 | 2.87 | 1.52 |
| 2008 | 2.26 | 4.13 | 1.31 |
| 2007 | 2.82 | 4.44 | 1.71 |
| 2006 | 1.4 | 1.78 | 1.1 |
| 2005 | 0.66 | 1.13 | 0.39 |
| 2004 | 0.6 | 1 | 0.42 |