| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.66 | 2.99 | 2.41 |
| 2024 | 2.29 | 3.01 | 1.79 |
| 2023 | 3.04 | 4.33 | 1.96 |
| 2022 | 2.06 | 2.67 | 1.8 |
| 2021 | 2.07 | 2.49 | 1.87 |
| 2020 | 2.49 | 2.98 | 1.93 |
| 2019 | 2.52 | 3.29 | 1.91 |
| 2018 | 3.91 | 5.74 | 2.09 |
| 2017 | 7.01 | 11.69 | 4.45 |
| 2016 | 14.48 | 21.64 | 10.1 |
| 2015 | 5.4 | 15.88 | 3.91 |
| 2014 | 3.4 | 4.18 | 2.87 |
| 2013 | 3.44 | 4.02 | 2.97 |
| 2012 | 3.82 | 5.02 | 2.55 |
| 2011 | 3.24 | 4.12 | 2.55 |
| 2010 | 3.79 | 4.79 | 2.94 |
| 2009 | 2.94 | 3.88 | 2.27 |
| 2008 | 2.64 | 4.26 | 1.57 |
| 2007 | 3.11 | 4.71 | 1.5 |
| 2006 | 1.32 | 1.57 | 1.09 |
| 2005 | 1.32 | 1.91 | 0.89 |
| 2004 | 1.32 | 2.18 | 0.98 |