Year	current US$
1960	13600000
1961	600000
1962	27300000
1963	22500000
1964	32500000
1965	37200000
1966	45000000
1967	45500000
1968	39804000
1969	49022000
1970	58366000
1971	53909000
1972	68366000
1973	86287000
1974	98880000
1975	101638000
1976	126271000
1977	195873000
1978	305707000
1979	466703000
1980	617615000
1981	534625000
1982	466236000
1983	323599000
1984	311474555
1985	368648655.4
1986	368341973.6
1987	310734239
1988	386760748.3
1989	363068923.90000004
1990	388779617.1
1991	355308561.6
1992	306344963.4
1993	308635414.2
1994	225271870
1995	299658362.59999996
1996	289415104.40000004
1997	294495493.8
1998	362604214.8
1999	315332586.8
2000	773341632
2001	324995018
2002	395359109
2003	490770079
2004	532572932.00000006
2005	736163156
2006	860519925
2007	955860192
2008	1208424493
2009	1627374949
2010	2272706962
2011	1917487809
2012	1688285082
2013	1715497371
2014	2152455827
2015	2461362575
2016	1867545604
2017	1776617762
2018	2663475483
2019	3541011380
2020	3598377035