| 序号 | 时间 (年) |
数据 (美元) |
|---|---|---|
| 1 | 2018 | |
| 2 | 2017 | |
| 3 | 2016 | |
| 4 | 2015 | |
| 5 | 2014 | |
| 6 | 2013 | |
| 7 | 2012 | 3258.19 |
| 8 | 2011 | 3370.92 |
| 9 | 2010 | 3895.22 |
| 10 | 2009 | 3679.95 |
| 11 | 2008 | 3626.13 |
| 12 | 2007 | 3536.90 |
| 13 | 2006 | 3435.02 |
| 14 | 2005 | 3327.61 |
| 15 | 2004 | 3142.12 |
| 16 | 2003 | 3022.45 |
| 17 | 2002 | 2933.64 |
| 18 | 2001 | 2854.34 |
| 19 | 2000 | 2763.47 |
| 20 | 1999 | 2617.16 |
| 21 | 1998 | 2558.42 |
| 22 | 1997 | 2456.26 |
| 23 | 1996 | 2362.86 |
| 24 | 1995 | 2287.96 |
| 25 | 1994 | 2195.76 |
| 26 | 1993 | 2090.39 |
| 27 | 1992 | 2038.81 |
| 28 | 1991 | 1913.50 |
| 29 | 1990 | 1809.11 |
