| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 21.3 | 22.82 | 18.31 |
| 2019 | 26.28 | 35.61 | 20.87 |
| 2018 | 24.14 | 29.84 | 18.55 |
| 2017 | 28.66 | 32.51 | 25.47 |
| 2016 | 99.71 | 281.25 | 30.2 |
| 2015 | 221.93 | 337.33 | 49.88 |
| 2014 | 43.48 | 55.4 | 36.19 |
| 2013 | 42.01 | 67.4 | 20.68 |
| 2012 | 69.82 | 291.05 | 17.4 |
| 2011 | 762.98 | 1697.86 | 172.01 |
| 2010 | 156.02 | 169.49 | 134.2 |
| 2009 | 349.14 | 706.37 | 124.74 |
| 2008 | 543.37 | 809.95 | 409.93 |
| 2007 | 843.27 | 1343.54 | 371.12 |
| 2006 | 395.65 | 626.36 | 275.72 |
| 2005 | 561.42 | 957.97 | 293.81 |
| 2004 | 613.25 | 1664.26 | 246.88 |
| 2003 | 365.19 | 590.96 | 269.49 |
| 2002 | 920.24 | 2492.26 | 104.43 |
| 2001 | 83.01 | 125.65 | 52.84 |
| 2000 | 48.77 | 100.08 | 29.77 |
| 1999 | 52.94 | 80.83 | 30.08 |
| 1998 | 24.28 | 32.92 | 18.86 |