| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 6.57 | 8.75 | 5.55 |
| 2023 | 8.19 | 9.94 | 6.91 |
| 2022 | 6.59 | 8.71 | 5.23 |
| 2021 | 8.79 | 10.84 | 6.91 |
| 2020 | 9.68 | 13.25 | 6.08 |
| 2019 | 5.58 | 7.62 | 3.46 |
| 2018 | 4.06 | 5.35 | 2.97 |
| 2017 | 3.28 | 4.28 | 2.74 |
| 2016 | 4.09 | 5.09 | 3.14 |
| 2015 | 5.25 | 7.78 | 3.13 |
| 2014 | 3.1 | 3.7 | 2.61 |
| 2013 | 2 | 3.65 | 1.23 |
| 2012 | 1.58 | 2.03 | 1.24 |
| 2011 | 2.25 | 2.99 | 1.65 |
| 2010 | 3.34 | 4.4 | 2.79 |
| 2009 | 2.83 | 3.86 | 1.91 |
| 2008 | 2.88 | 5.36 | 1.34 |
| 2007 | 4.23 | 6.53 | 2.14 |
| 2006 | 2.25 | 3.27 | 1.85 |
| 2005 | 1.42 | 2.14 | 1.05 |
| 2004 | 1.63 | 2.66 | 1.14 |