| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.28 | 8.66 | 5.93 |
| 2024 | 4.17 | 8.14 | 2.31 |
| 2023 | 3.87 | 4.52 | 3.47 |
| 2022 | 3.7 | 5.57 | 2.37 |
| 2021 | 3.43 | 5.62 | 2.38 |
| 2020 | 2.85 | 3.44 | 2.48 |
| 2019 | 2.46 | 2.81 | 1.77 |
| 2018 | 2.2 | 3.04 | 1.54 |
| 2017 | 4.69 | 6.41 | 2.68 |
| 2016 | 7.24 | 8.81 | 5.84 |
| 2015 | 7.73 | 12.07 | 4.11 |
| 2014 | 5.57 | 7.52 | 3.46 |
| 2013 | 4.44 | 5.96 | 3.01 |
| 2012 | 3.45 | 4.44 | 2.65 |
| 2011 | 4.75 | 6.37 | 3.52 |
| 2010 | 5.61 | 7.15 | 3.83 |
| 2009 | 4.18 | 5.6 | 2.77 |
| 2008 | 4.53 | 10.32 | 2.15 |
| 2007 | 5.46 | 9.7 | 2.19 |
| 2006 | 2.26 | 2.72 | 1.79 |
| 2005 | 1.61 | 1.97 | 1.14 |