| 序号 | 时间 (年) |
数据 (美元) |
|---|---|---|
| 1 | 2019 | |
| 2 | 2018 | |
| 3 | 2017 | |
| 4 | 2016 | |
| 5 | 2015 | |
| 6 | 2014 | |
| 7 | 2013 | 6620.00 |
| 8 | 2012 | 6080.00 |
| 9 | 2011 | 5590.00 |
| 10 | 2010 | 5170.00 |
| 11 | 2009 | 5090.00 |
| 12 | 2008 | 5040.00 |
| 13 | 2007 | 4740.00 |
| 14 | 2006 | 4410.00 |
| 15 | 2005 | 3970.00 |
| 16 | 2004 | 3500.00 |
| 17 | 2003 | 3100.00 |
| 18 | 2002 | 2830.00 |
| 19 | 2001 | 2760.00 |
| 20 | 2000 | 2620.00 |
| 21 | 1999 | 2400.00 |
| 22 | 1998 | 2240.00 |
| 23 | 1997 | 2500.00 |
| 24 | 1996 | 2700.00 |
| 25 | 1995 | 2540.00 |
| 26 | 1994 | 2130.00 |
| 27 | 1993 | 1870.00 |
| 28 | 1992 | 2120.00 |
| 29 | 1991 | 2330.00 |
| 30 | 1990 | 2650.00 |
| 31 | 1989 | 2740.00 |
| 32 | 1988 | 2770.00 |
| 33 | 1987 | 2480.00 |
| 34 | 1986 | 2380.00 |
| 35 | 1985 | 2300.00 |
| 36 | 1984 | 2300.00 |
| 37 | 1983 | 2180.00 |
| 38 | 1982 | 2350.00 |
| 39 | 1981 | 2440.00 |
| 40 | 1980 | 2150.00 |
| 41 | 1979 | 2000.00 |
| 42 | 1978 | 1780.00 |
| 43 | 1977 | 1600.00 |
| 44 | 1976 | 1540.00 |
| 45 | 1975 | 1490.00 |
| 46 | 1974 | 1230.00 |
| 47 | 1973 | 1030.00 |
| 48 | 1972 | 830.00 |
