| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.27 | 9.46 | 6.96 |
| 2024 | 7.58 | 9.56 | 6.24 |
| 2023 | 11.8 | 15.52 | 8.63 |
| 2022 | 13.2 | 16.73 | 9.31 |
| 2021 | 8.27 | 13.82 | 4.64 |
| 2020 | 7.32 | 9.75 | 5.01 |
| 2019 | 6.01 | 7.99 | 4.87 |
| 2018 | 7.25 | 11.7 | 3.59 |
| 2017 | 8.95 | 12.36 | 7.13 |
| 2016 | 8.3 | 10.39 | 6.85 |
| 2015 | 10.21 | 22.74 | 5.49 |
| 2014 | 4.58 | 7.54 | 3.03 |
| 2013 | 3.49 | 4.81 | 2.87 |
| 2012 | 3.81 | 4.97 | 2.59 |
| 2011 | 4.89 | 5.88 | 3.56 |
| 2010 | 5 | 6.37 | 3.13 |
| 2009 | 3.12 | 3.68 | 2.35 |
| 2008 | 2.63 | 4.57 | 1.19 |
| 2007 | 3.8 | 5.72 | 1.4 |
| 2006 | 1.47 | 1.81 | 1.21 |
| 2005 | 1.45 | 1.8 | 0.94 |
| 2004 | 1.58 | 2.8 | 1.02 |