Year	current US$
1960	18500000
1962	491000
1963	590000
1964	490000
1965	400000
1967	4438000
1968	6039000
1969	4307000
1970	3436000
1971	3065000
1972	3023000
1973	5063000
1974	11322000
1981	15102727.270000001
1982	24210000
1983	24002727.27
1984	11381818.18
1985	16554760.040000001
1986	14118656.850000001
1987	23252201
1988	55862563.28
1989	95351293.72999999
1990	64417225.01
1991	82106962.21000001
1992	103448610.4
1993	240500000
1994	300400000
1995	311200000
1996	320700000
1997	192110000
1998	370799279.5
1999	462528708.3
2000	335938885
2001	309126801
2002	311009617
2003	328696175
2004	387740964
2005	555124708
2006	1032530418.9999999
2007	1077288471
2008	1323812072
2009	1281084257
2010	1897996827
2011	2811859682
2012	3035552654
2013	3563477333
2014	4380760539
2015	3814063801
2016	4184615047
2017	4804581749
2018	5696793112
2019	5857985070
2020	6240071783