| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.92 | 8.76 | 4.94 |
| 2024 | 7.68 | 10.69 | 5.55 |
| 2023 | 7.35 | 10.02 | 5.42 |
| 2022 | 5.49 | 7.95 | 4.44 |
| 2021 | 5.29 | 7.05 | 3.84 |
| 2020 | 7.7 | 11.45 | 4.79 |
| 2019 | 8.24 | 11.44 | 4.77 |
| 2018 | 7.94 | 10.59 | 4.94 |
| 2017 | 11.47 | 17.3 | 9.34 |
| 2016 | 14.41 | 22.59 | 12.15 |
| 2015 | 27.4 | 43.15 | 17.19 |
| 2014 | 17.2 | 37.22 | 8.95 |
| 2013 | 5.59 | 8.95 | 4.18 |
| 2012 | 5.95 | 7.21 | 4.35 |
| 2011 | 8.23 | 12.31 | 5.17 |
| 2010 | 12.6 | 21.37 | 8.21 |
| 2009 | 11.57 | 21.42 | 6.56 |
| 2008 | 7.81 | 14.49 | 3.85 |
| 2007 | 7.53 | 13.87 | 3 |
| 2006 | 2.33 | 3.13 | 1.45 |
| 2005 | 1.57 | 2.23 | 1.04 |
| 2004 | 2.63 | 3.61 | 1.82 |