| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.27 | 4.72 | 3.8 |
| 2024 | 3.78 | 4.83 | 2.81 |
| 2023 | 5.12 | 6.71 | 3.92 |
| 2022 | 5.26 | 6.56 | 3.53 |
| 2021 | 4.52 | 6.45 | 3.52 |
| 2020 | 4.96 | 6.09 | 3.66 |
| 2019 | 5.28 | 8.78 | 2.61 |
| 2018 | 1.96 | 2.8 | 1.48 |
| 2017 | 2.75 | 3.81 | 2.1 |
| 2016 | 3.62 | 4.58 | 3.03 |
| 2015 | 4.59 | 8.62 | 2.83 |
| 2014 | 3.43 | 4.16 | 2.51 |
| 2013 | 2.57 | 3.72 | 2 |
| 2012 | 2.57 | 3.5 | 1.71 |
| 2011 | 4.24 | 6.26 | 2.75 |
| 2010 | 5.02 | 7.09 | 3.79 |
| 2009 | 2.28 | 4.99 | 1.17 |
| 2008 | 1.72 | 3.51 | 0.74 |
| 2007 | 2.47 | 3.36 | 1.58 |
| 2006 | 1.41 | 1.79 | 0.89 |
| 2005 | 1.23 | 1.7 | 0.88 |