Year	current US$
1970	3042060.79208526
1971	3224961.83746616
1972	17521963.6727911
1973	76826689.6582465
1974	466854552.120085
1975	514382445.705683
1976	707991771.46025
1977	830149435.557493
1978	888743947.396956
1980	2227540488.51413
1981	1130365969.66128
1982	677117256.051803
1983	816761255.598014
1984	970675605.044634
1985	777448528.983102
1986	483444834.061549
1987	564046133.811514
1988	444121549.922098
1989	638338998.895947
1990	906980538.076164
1991	586262255.018424
1992	734016985.869011
1993	734042571.799952
1994	684801431.538377
1995	732968253.719247
1996	901057742.088085
1997	897664466.886092
1998	474356593.679488
1999	728566636.743712
2000	1416156953.47781
2001	1046511175.51584
2002	1014648212.49224
2003	1275914349.51683
2004	1654157652.71593
2005	2351149796.9937
2006	3168599561.61624
2007	3074574364.26833
2008	3240410715.03194
2009	1708064703.20026
2010	2536840121.40923
2011	3869569689.21128
2012	3328859284.53639
2013	2547477282.4886
2014	2467509969.18795
2015	1657135327.34051
2016	1197377206.49383
2017	1369515292.59111
2018	2013947864.25648
2019	1917361465.66899
2020	1137056934.28104
2021	2260884299.15776