Year	current US$
1975	52000000
1976	54000000
1977	69300000
1978	92500000
1979	149400000
1980	158900000
1981	196700000
1982	243500000
1983	149300000
1984	203300000
1985	171400000
1986	214700000
1987	228900000
1988	266600000
1989	272800000
1990	361000000
1991	385100000
1992	391100000
1993	510300000
1994	568700000
1995	675700000
1996	623800000
1997	629600000
1998	548900000
1999	463300000
2000	390260000
2001	362690000
2002	321290000
2003	318346500
2004	287400000
2005	329207802.023238
2006	365343976.282048
2007	443022322.467948
2008	761001078.999594
2009	706839866.449946
2010	1076480454.74511
2011	1243422935.48755
2012	1322250945.61802
2013	1514424642.21334
2014	1624767581.66506
2015	1644193350.73559
2016	1638384188.48783
2017	1857629701.7485
2018	1996149933.44333
2019	2004163897.90214
2020	1214724357.60378
2021	1695912569.287005
2022	2374812161.5208464
2023	2455002089.3777466