| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.43 | 5.97 | 3.49 |
| 2024 | 4.23 | 5.89 | 3.22 |
| 2023 | 5.07 | 7.09 | 3.74 |
| 2022 | 4.86 | 6.28 | 3.91 |
| 2021 | 5.4 | 8.49 | 3.77 |
| 2020 | 8.88 | 14.14 | 5.2 |
| 2019 | 7.35 | 10.11 | 5.54 |
| 2018 | 9.3 | 12.5 | 6.52 |
| 2017 | 14.71 | 19.68 | 10.74 |
| 2016 | 22.12 | 28.51 | 16.86 |
| 2015 | 25.01 | 40.74 | 12.47 |
| 2014 | 10.46 | 20.36 | 4.98 |
| 2013 | 3.99 | 5.93 | 2.82 |
| 2012 | 3.48 | 5.09 | 2.54 |
| 2011 | 6.29 | 8.23 | 3.6 |
| 2010 | 6.09 | 8.28 | 4.46 |
| 2009 | 4.55 | 6.23 | 3.12 |
| 2008 | 3.88 | 8.5 | 1.92 |
| 2007 | 7.7 | 13.82 | 2.31 |
| 2006 | 2.78 | 3.97 | 1.93 |
| 2005 | 3.03 | 3.96 | 2.26 |
| 2004 | 4.94 | 9.4 | 2.69 |