| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 12.23 | 13.5 | 10.26 |
| 2023 | 12.61 | 14.72 | 9.86 |
| 2022 | 9.21 | 11.46 | 7.24 |
| 2021 | 15.66 | 23.81 | 9.73 |
| 2020 | 18.94 | 23.81 | 15.95 |
| 2019 | 16.13 | 19.67 | 11.59 |
| 2018 | 16.43 | 20.9 | 11.37 |
| 2017 | 12.56 | 16.54 | 9.92 |
| 2016 | 10.08 | 10.88 | 8.97 |
| 2015 | 10.5 | 12.76 | 8.15 |
| 2014 | 7.89 | 8.96 | 6.84 |
| 2013 | 7.55 | 8.92 | 6.28 |
| 2012 | 7.1 | 7.94 | 6.38 |
| 2011 | 8.98 | 11.86 | 7.63 |
| 2010 | 10.28 | 12.74 | 8.44 |
| 2009 | 9.18 | 11.57 | 7.84 |
| 2008 | 9.42 | 14.67 | 6.71 |
| 2007 | 10.67 | 13.97 | 6.24 |
| 2006 | 4.74 | 7.97 | 3 |
| 2005 | 2.99 | 3.54 | 1.5 |
| 2004 | 2.13 | 2.97 | 1.59 |