| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 17.69 | 19.03 | 14.92 |
| 2022 | 19.65 | 24.26 | 16.16 |
| 2021 | 20.63 | 28.81 | 14.2 |
| 2020 | 26.03 | 35.48 | 18.39 |
| 2019 | 16.93 | 21.34 | 14.05 |
| 2018 | 18.57 | 22.87 | 14.76 |
| 2017 | 17.82 | 21.59 | 15.11 |
| 2016 | 16.47 | 18.68 | 13.64 |
| 2015 | 17.93 | 23.2 | 13.29 |
| 2014 | 19.77 | 29.77 | 14.8 |
| 2013 | 26.97 | 36.81 | 19.49 |
| 2012 | 70.22 | 146.31 | 24.52 |
| 2011 | 50.69 | 79.82 | 30.03 |
| 2010 | 34.87 | 55.21 | 28.91 |
| 2009 | 31.29 | 38.23 | 26.78 |
| 2008 | 40.86 | 71.27 | 23.54 |
| 2007 | 47.19 | 73.09 | 27.54 |
| 2006 | 33.15 | 40.31 | 19.22 |
| 2005 | 22.91 | 27.13 | 17.92 |
| 2004 | 21.83 | 26.59 | 16.51 |
| 2003 | 19.92 | 23.03 | 17.9 |
| 2002 | 22.02 | 23.3 | 19.72 |
| 2001 | 26.84 | 32.22 | 18.81 |
| 2000 | 34.42 | 41.2 | 27.17 |
| 1999 | 34.35 | 60.56 | 28.29 |