| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 14.89 | 18.72 | 12.81 |
| 2022 | 12.15 | 13.96 | 9.62 |
| 2021 | 26.57 | 59.64 | 12.31 |
| 2020 | 23.2 | 38.09 | 12.72 |
| 2019 | 12.84 | 18.59 | 4.16 |
| 2018 | 9.14 | 11.67 | 6 |
| 2017 | 15.4 | 24.7 | 10.84 |
| 2016 | 20.49 | 26.9 | 15.86 |
| 2015 | 21.77 | 29.54 | 16.58 |
| 2014 | 13.26 | 18.6 | 10.68 |
| 2013 | 14.65 | 19.82 | 11.69 |
| 2012 | 15.75 | 18.13 | 12.42 |
| 2011 | 22.26 | 37.73 | 12.01 |
| 2010 | 28.34 | 38.39 | 19.75 |
| 2009 | 22.69 | 35.01 | 10.94 |
| 2008 | 24.3 | 52.22 | 7.66 |
| 2007 | 54.35 | 70.83 | 37.9 |
| 2006 | 26.89 | 40.19 | 20.27 |
| 2005 | 22.57 | 39.5 | 17.17 |
| 2004 | 25.28 | 31.66 | 14 |
| 2003 | 26.47 | 31.89 | 21.43 |
| 2002 | 39.8 | 61.57 | 27.1 |