| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 5.65 | 6.63 | 4.69 |
| 2023 | 8.01 | 13.14 | 4.78 |
| 2022 | 13.93 | 18.65 | 9.49 |
| 2021 | 15.42 | 22.82 | 11.02 |
| 2020 | 8.7 | 13.34 | 6.08 |
| 2019 | 5.75 | 7.11 | 4.96 |
| 2018 | 5.91 | 6.98 | 4.58 |
| 2017 | 6.91 | 8.51 | 5.4 |
| 2016 | 6.05 | 7.33 | 4.3 |
| 2015 | 5.52 | 7.47 | 3.94 |
| 2014 | 4.95 | 6.5 | 3.91 |
| 2013 | 3.34 | 4.19 | 2.7 |
| 2012 | 2.74 | 3.32 | 2.19 |
| 2011 | 4.16 | 6 | 2.5 |
| 2010 | 6.01 | 8.09 | 4.94 |
| 2009 | 3.98 | 5.48 | 2.17 |
| 2008 | 4.68 | 9.7 | 1.8 |
| 2007 | 7.96 | 9.42 | 5.75 |
| 2006 | 5.34 | 6.32 | 4.34 |
| 2005 | 4.51 | 6.4 | 3.03 |
| 2004 | 5.79 | 8.96 | 3.79 |