| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.99 | 10.36 | 6.93 |
| 2024 | 5.59 | 8.21 | 3.67 |
| 2023 | 6.01 | 6.95 | 4.94 |
| 2022 | 5.88 | 7.04 | 4.49 |
| 2021 | 5.54 | 8.08 | 3.82 |
| 2020 | 11.05 | 25.27 | 6.53 |
| 2019 | 8.85 | 11 | 7.07 |
| 2018 | 8.49 | 11.13 | 6.14 |
| 2017 | 10.88 | 13.8 | 9.06 |
| 2016 | 13.68 | 18.33 | 11.05 |
| 2015 | 14.77 | 19.62 | 8.54 |
| 2014 | 8.96 | 16.44 | 5.07 |
| 2013 | 13.63 | 23.94 | 7.04 |
| 2012 | 8.44 | 10.75 | 5.65 |
| 2011 | 10.5 | 13.66 | 6.56 |
| 2010 | 12.62 | 17.21 | 9.59 |
| 2009 | 6.41 | 11.93 | 1.13 |
| 2008 | 1.93 | 3.73 | 0.84 |
| 2007 | 3.4 | 4.94 | 2.05 |
| 2006 | 1.98 | 2.42 | 1.24 |
| 2005 | 1.28 | 1.67 | 0.92 |
| 2004 | 1.9 | 3.91 | 1.02 |