| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.42 | 4.84 | 4.05 |
| 2024 | 4.61 | 6.12 | 3.9 |
| 2023 | 8.37 | 11.93 | 4.64 |
| 2022 | 8.7 | 10.78 | 7.2 |
| 2021 | 8.15 | 10.78 | 6.35 |
| 2020 | 5.03 | 7.97 | 3.3 |
| 2019 | 4.3 | 5.49 | 3.85 |
| 2018 | 5.05 | 6.19 | 3.68 |
| 2017 | 7.33 | 8.34 | 5.78 |
| 2016 | 7.09 | 8.09 | 5.75 |
| 2015 | 6.74 | 8.32 | 4.47 |
| 2014 | 4.67 | 6.2 | 2.93 |
| 2013 | 3.11 | 3.85 | 2.51 |
| 2012 | 4.03 | 4.88 | 2.9 |
| 2011 | 5.72 | 7.57 | 4.05 |
| 2010 | 7.98 | 10.02 | 6.35 |
| 2009 | 6.45 | 7.34 | 5.47 |
| 2008 | 8.82 | 16.84 | 4.41 |
| 2007 | 11.66 | 17.41 | 6.05 |
| 2006 | 4.61 | 6.32 | 3.01 |
| 2005 | 3.04 | 4.25 | 2.21 |
| 2004 | 3.25 | 5.42 | 1.94 |