| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 20.18 | 22.06 | 17.72 |
| 2019 | 25.67 | 38.04 | 19.8 |
| 2018 | 28.41 | 45.08 | 18.11 |
| 2017 | 46.1 | 64.41 | 33.34 |
| 2016 | 101.48 | 296.41 | 33.89 |
| 2015 | 260.53 | 384.35 | 140.2 |
| 2014 | 162.71 | 334.94 | 122.73 |
| 2013 | 137.22 | 206.35 | 90.14 |
| 2012 | 68.16 | 130.75 | 14.27 |
| 2011 | 31.59 | 47.15 | 14.93 |
| 2010 | 54.55 | 74 | 40.33 |
| 2009 | 56.23 | 68.49 | 43.31 |
| 2008 | 65.55 | 103.99 | 36.12 |
| 2007 | 88.68 | 135.29 | 38.36 |
| 2006 | 38.51 | 50.72 | 31.2 |
| 2005 | 53.1 | 88.9 | 39.2 |
| 2004 | 109.54 | 175.59 | 81.56 |
| 2003 | 171.26 | 266.04 | 102.31 |
| 2002 | 5067.9 | 9802.09 | 474.34 |
| 2001 | 121.27 | 143.27 | 94.42 |
| 2000 | 75.05 | 93.46 | 56.73 |
| 1999 | 40.02 | 52.09 | 28.16 |
| 1998 | 32.5 | 43.47 | 25.39 |