Year	current US$
1970	18000000
1971	26000000
1972	34000000
1973	34000000
1974	31000000
1975	41000000
1976	64000000
1977	88000000
1978	89000000
1979	69000000
1980	102000000
1981	151000000
1982	205000000
1983	206000000
1984	215000000
1985	231000000
1986	232000000
1987	220000000
1988	174000000
1989	208000000
1990	205000000
1991	158000000
1992	189000000
1993	227000000
1994	457000000
1995	331000000
1996	290000000
1997	197000000
1998	244500002.9858202
1999	198559997.92739737
2000	166039999.36394387
2001	268180000.30517542
2002	265650003.09981406
2003	278580002.1179021
2004	309640003.2229722
2005	299930002.3205579
2006	375510002.51621
2007	367900004.29563224
2008	622919991.3199986
2009	670639989.4040078
2010	487550000.810995
2011	629100000.8247793
2012	635159994.61338
2013	731860000.9791558
2014	541569987.2039258
2015	369079997.4482508
2016	367150002.29328877
2017	527460003.77275056
2018	527760005.12577575
2019	392639999.26112604
2020	603049998.0151652
2021	608759994.5999686
2022	603450004.6297904