| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 6.36 | 8.28 | 4.68 |
| 2023 | 9.28 | 11.46 | 7.9 |
| 2022 | 8.25 | 10.64 | 6.39 |
| 2021 | 14.94 | 23.82 | 9.63 |
| 2020 | 21.07 | 35.39 | 11.81 |
| 2019 | 12.81 | 15.41 | 10.15 |
| 2018 | 12.45 | 14.38 | 10.57 |
| 2017 | 14.98 | 19.63 | 11.28 |
| 2016 | 18.93 | 23.75 | 15.17 |
| 2015 | 19.77 | 30.74 | 14.83 |
| 2014 | 14.54 | 17.81 | 12.61 |
| 2013 | 14.82 | 17.13 | 12.76 |
| 2012 | 14.31 | 16.4 | 11.8 |
| 2011 | 14.96 | 19.07 | 11.43 |
| 2010 | 21.16 | 41.86 | 15.03 |
| 2009 | 27.37 | 44.82 | 18.47 |
| 2008 | 24.57 | 32.96 | 16.85 |
| 2007 | 20.37 | 31.95 | 8.85 |
| 2006 | 5.38 | 9.62 | 2.91 |
| 2005 | 3.02 | 3.89 | 1.87 |