Year	current US$
1970	6169999.9589473
1971	8950000.08679927
1972	11800000.05848706
1973	19370000.358670954
1974	28760000.107809868
1975	42230000.51267442
1976	48670000.10237095
1977	66279999.99932938
1978	79280000.29921529
1979	94649999.79734422
1980	116790001.15022054
1981	119469998.74711043
1982	150689998.65651134
1983	150489997.99787995
1984	138359998.2447922
1985	157909999.2904812
1986	223109998.46458426
1987	240970000.53152442
1988	286200005.41582704
1989	261399996.80593628
1990	351079999.47108364
1991	334739996.8933315
1992	342019996.95971614
1993	283070003.8783253
1994	342739998.5566736
1995	341780002.6535989
1996	343350000.305101
1997	347219999.4102119
1998	328110000.0999868
1999	283850000.243634
2000	265159999.20666218
2001	236809999.21448544
2002	344999997.9771673
2003	461970001.6174466
2004	477769996.67100596
2005	568410004.8430264
2006	627320001.8703936
2007	740639991.8254465
2008	828169996.2113057
2009	726609999.6864792
2010	719889992.6841257
2011	819119992.1965595
2012	632490003.6156179
2013	795390008.0695752
2014	673890000.1496077
2015	471410001.9410253
2016	441329995.76628226
2017	478460001.4742464
2018	503139997.5419044
2019	505900003.91006476