Year	current US$
1970	3807272.25663147
1971	4127159.39962038
1972	3938876.94439493
1973	5146671.89346752
1974	6127618.71638874
1975	7872925.71209948
1976	5972843.16610425
1977	10120775.2674658
1978	12540859.2366143
1979	13273239.3395343
1980	14763769.2443198
1981	14465654.2400832
1982	31988127.678917
1983	22269619.6502934
1984	22610305.9627337
1985	9431958.21210548
1986	24166362.7016466
1987	24642354.5375812
1988	25290988.2429764
1989	26693552.9082633
1990	27076295.4129148
1991	29067244.6378781
1992	23670358.2780703
1993	22407972.6547394
1994	19185112.3661255
1995	29319005.6638039
1996	30909642.1806962
1997	31182510.6044729
1998	40916815.5666767
1999	27898458.2184248
2000	19888282.9177975
2001	19708691.998711
2002	15478329.4420178
2003	13550054.5886592
2004	6514188.13370157
2005	1576165.09012303
2006	8152444.54507172
2007	13493455.0714633
2008	33616493.1016533
2009	42620499.8259824
2010	62546834.9088685
2011	70367215.8193426
2012	125957662.782881
2013	110615833.930846
2014	171730302.783045
2015	156730479.237721
2016	120008005.751878
2017	155651389.061289
2018	87176206.2418008
2019	112894075.901771
2020	102330441.866213
2021	95069135.4886144