| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.09 | 3.4 | 2.74 |
| 2024 | 2.91 | 3.84 | 2.42 |
| 2023 | 3.46 | 4.16 | 2.85 |
| 2022 | 3.92 | 5.02 | 2.88 |
| 2021 | 4.71 | 5.85 | 3.67 |
| 2020 | 4.25 | 5.71 | 3.51 |
| 2019 | 4.46 | 6.44 | 3.22 |
| 2018 | 4.1 | 5.84 | 2.91 |
| 2017 | 6.51 | 8.41 | 4.36 |
| 2016 | 10.25 | 17.36 | 6.97 |
| 2015 | 12.7 | 19.13 | 7.51 |
| 2014 | 7.53 | 9.67 | 5.56 |
| 2013 | 5.42 | 6.97 | 4.28 |
| 2012 | 6.14 | 8.16 | 4.07 |
| 2011 | 8.75 | 12.85 | 4.89 |
| 2010 | 9.49 | 16.56 | 6.1 |
| 2009 | 5.65 | 8.66 | 2.73 |
| 2008 | 3.47 | 4.78 | 2.29 |
| 2007 | 4.66 | 7.19 | 2.96 |
| 2006 | 3.56 | 4.76 | 2.87 |
| 2005 | 3.19 | 4.49 | 2.15 |