| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.78 | 3.52 | 2.56 |
| 2024 | 2.66 | 3.4 | 1.84 |
| 2023 | 3.4 | 4.39 | 2.51 |
| 2022 | 2.74 | 3.78 | 2.03 |
| 2021 | 4.41 | 6.92 | 2.95 |
| 2020 | 3.64 | 5.01 | 2.74 |
| 2019 | 3.53 | 4.32 | 2.49 |
| 2018 | 3.75 | 5.35 | 2.49 |
| 2017 | 7.33 | 9.57 | 5 |
| 2016 | 7.76 | 9.01 | 6.12 |
| 2015 | 5.95 | 8.05 | 3.58 |
| 2014 | 4.12 | 5.87 | 2.91 |
| 2013 | 3.35 | 3.88 | 2.91 |
| 2012 | 3.91 | 4.82 | 3.04 |
| 2011 | 5.59 | 7.06 | 4.02 |
| 2010 | 4.47 | 6.45 | 3.05 |
| 2009 | 2.79 | 3.71 | 1.58 |
| 2008 | 2.27 | 4.12 | 1.29 |
| 2007 | 3.17 | 4.81 | 1.59 |
| 2006 | 1.44 | 1.74 | 1.2 |
| 2005 | 1.51 | 1.79 | 1.17 |