Year	current US$
1960	121690000
1961	94990000
1962	112100000
1963	142700000
1964	131000000
1965	96910000
1966	100310000
1967	71420000
1968	68920000
1969	45620000
1970	31400000
1971	48843428.6955577
1972	40201731.7258583
1973	91889486.7141437
1974	182368054.277472
1975	132800388.669664
1976	118329919.495335
1977	103286050.25155
1978	96352051.9082728
1979	203265114.418418
1980	260574473.901072
1981	229022524.865822
1982	104342784.039737
1983	89360100.5154794
1984	62112456.509878
1985	33921968.3655536
1986	33100000
1987	27241866.1067684
1988	77434569.5792009
1989	263378232.186506
1990	312796688.053947
1991	258385956.028551
1992	280113750.051563
1993	302916579.486201
1994	422048837.304362
1995	561146420.306573
1996	229188718.954549
1997	249813064.019257
1998	314918680.962807
1999	265462974.837735
2000	222987555.090852
2001	400458801.130051
2002	469988328.504307
2003	550224170.680025
2004	672134265.912112
2005	770729162.736186
2006	1235606375.35429
2007	3088878881.68998
2008	3717455596.43089
2009	5251693589.24314
2010	5716855816.89603
2011	7003907903.01112
2012	6964023905.37492
2013	8554063723.11893
2014	4227646938.8808
2015	4350888942.14029
2016	4618587873.75254
2017	4910970480.80223
2018	5346885782.45813
2019	5468336044.05248
2020	7228120715.09329