Year	current US$
1975	16786000
1976	25654000
1977	38878000
1978	41646000
1979	73692000
1980	74531000
1981	66718999.99999999
1982	57803000
1983	62560000
1984	90494000
1985	70594000
1986	65680000.00000001
1987	66349999.99999999
1988	87573368.75999999
1989	77677378.09
1990	75078689.42999999
1991	84713508.73
1992	131504811.3
1993	166782009.8
1994	162192453.7
1995	199754308.6
1996	242964657.10000002
1997	211348542.1
1998	195995745.7
1999	166269492.7
2000	32082915
2001	22766647
2002	24545604
2003	44956560
2004	64137485.99999999
2005	70570238
2006	108089421
2007	162113572
2008	214820176
2009	213983510
2010	215816115
2011	411375725
2012	466820025
2013	483149457
2014	460827106
2015	412346033
2016	438719979
2017	496743958
2018	562745438
2019	443255062
2020	369356561