| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.87 | 8.62 | 7.03 |
| 2024 | 5.55 | 9.71 | 3.49 |
| 2023 | 4.81 | 5.85 | 3.64 |
| 2022 | 4.26 | 5.77 | 2.79 |
| 2021 | 6.59 | 10.88 | 4.97 |
| 2020 | 6.55 | 9.67 | 3.95 |
| 2019 | 4.8 | 7.5 | 3.52 |
| 2018 | 5.39 | 7.3 | 3.84 |
| 2017 | 8.72 | 14.89 | 6.32 |
| 2016 | 17.3 | 28.78 | 12.62 |
| 2015 | 28.28 | 48.08 | 16.78 |
| 2014 | 11.76 | 22.08 | 6.31 |
| 2013 | 7.4 | 8.84 | 5.82 |
| 2012 | 7.92 | 9.88 | 5.24 |
| 2011 | 7.84 | 9.31 | 5.5 |
| 2010 | 7.45 | 11.16 | 5.7 |
| 2009 | 4.58 | 6.26 | 2.57 |
| 2008 | 4.58 | 10.05 | 1.93 |
| 2007 | 6.62 | 10.73 | 2.23 |
| 2006 | 1.89 | 3.2 | 1.06 |
| 2005 | 1.42 | 1.79 | 1.02 |
| 2004 | 2.39 | 4.62 | 1.28 |