| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.01 | 5.56 | 4.22 |
| 2024 | 4.35 | 6.29 | 3.13 |
| 2023 | 6.01 | 7.42 | 5.33 |
| 2022 | 5.49 | 6.54 | 4.45 |
| 2021 | 5.58 | 6.39 | 4.88 |
| 2020 | 8.45 | 16.24 | 6.17 |
| 2019 | 9.67 | 13.83 | 7.58 |
| 2018 | 10.36 | 14.36 | 7.44 |
| 2017 | 16.22 | 22.12 | 13.37 |
| 2016 | 18.68 | 24.14 | 11.75 |
| 2015 | 12.54 | 20.39 | 5.72 |
| 2014 | 4.83 | 7.01 | 2.89 |
| 2013 | 2.64 | 3.78 | 2.2 |
| 2012 | 2.24 | 2.76 | 1.73 |
| 2011 | 3.43 | 3.85 | 3.02 |
| 2010 | 4.69 | 7.56 | 3.28 |
| 2009 | 3.58 | 5.51 | 1.26 |
| 2008 | 2.08 | 3.5 | 0.76 |
| 2007 | 3.94 | 7.9 | 2.32 |
| 2006 | 5.42 | 7.96 | 3.73 |
| 2005 | 4.99 | 6.32 | 3.65 |