| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.23 | 5.78 | 4.89 |
| 2024 | 2.84 | 6.72 | 1.53 |
| 2023 | 2.61 | 3.67 | 1.59 |
| 2022 | 5.19 | 17.51 | 2.36 |
| 2021 | 6.31 | 12.39 | 2.56 |
| 2020 | 4.51 | 7.67 | 2.82 |
| 2019 | 7.01 | 9.46 | 5.72 |
| 2018 | 5.12 | 7.84 | 2.11 |
| 2017 | 5.95 | 12.1 | 2.46 |
| 2016 | 9.91 | 13.21 | 6.23 |
| 2015 | 8.69 | 16.22 | 5.57 |
| 2014 | 4.47 | 7.4 | 2.64 |
| 2013 | 4.22 | 7.66 | 2.78 |
| 2012 | 4.13 | 6.11 | 1.71 |
| 2011 | 2.99 | 4.17 | 1.8 |
| 2010 | 3.04 | 4.23 | 2.05 |
| 2009 | 8.9 | 20.59 | 3.96 |
| 2008 | 13.84 | 27.61 | 5.9 |
| 2007 | 12.08 | 27.61 | 2.36 |
| 2006 | 1.59 | 2.59 | 0.79 |
| 2005 | 0.93 | 1.11 | 0.78 |
| 2004 | 1.56 | 3.03 | 0.93 |