| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 7.66 | 10.11 | 5.5 |
| 2023 | 7.46 | 8.93 | 6.49 |
| 2022 | 5.81 | 7.72 | 4.85 |
| 2021 | 7.79 | 12.94 | 5.3 |
| 2020 | 9.18 | 14.36 | 2.83 |
| 2019 | 3.73 | 4.55 | 2.91 |
| 2018 | 4.76 | 6.53 | 3.37 |
| 2017 | 6.45 | 7.33 | 5.74 |
| 2016 | 6.22 | 7.28 | 5.24 |
| 2015 | 6.86 | 8.99 | 5.15 |
| 2014 | 5.82 | 6.59 | 4.99 |
| 2013 | 8.66 | 12.95 | 6.26 |
| 2012 | 9.65 | 11.26 | 8.61 |
| 2011 | 11.99 | 15.53 | 9.55 |
| 2010 | 11.12 | 14.76 | 8.31 |
| 2009 | 6.43 | 9.03 | 4.25 |
| 2008 | 8.23 | 15.14 | 3.94 |
| 2007 | 9.87 | 16.38 | 4.86 |
| 2006 | 4.17 | 5.67 | 2.44 |
| 2005 | 3.04 | 4.2 | 2.35 |
| 2004 | 2.77 | 3.91 | 2.31 |