| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 17.82 | 20.16 | 14.56 |
| 2019 | 15.89 | 24.82 | 9.6 |
| 2018 | 15.97 | 27.09 | 9.35 |
| 2017 | 20.35 | 24.7 | 14.86 |
| 2016 | 57.27 | 131.92 | 22.87 |
| 2015 | 206.78 | 520.24 | 53.26 |
| 2014 | 49.54 | 73.3 | 32.79 |
| 2013 | 91.61 | 127.96 | 52.74 |
| 2012 | 109.62 | 202.18 | 70.52 |
| 2011 | 392.03 | 982.45 | 146.3 |
| 2010 | 925.07 | 2031.26 | 520.23 |
| 2009 | 802.09 | 943.51 | 672.68 |
| 2008 | 700.69 | 1214.38 | 349.8 |
| 2007 | 716.33 | 1139.41 | 458.16 |
| 2006 | 0 | -6.58 | |
| 2005 | 230.84 | 256.48 | 194.75 |
| 2004 | 197.2 | 279.26 | 132.35 |
| 2003 | 126.63 | 196.83 | 80.3 |
| 2002 | 118.07 | 140.42 | 99.65 |
| 2001 | 94.28 | 118.82 | 71.8 |
| 2000 | 55.54 | 73.35 | 41.48 |
| 1999 | 29.28 | 39.23 | 22.56 |
| 1998 | 58.16 | 76.65 | 42.52 |