Year	current US$
1976	28404943.1356818
1977	34587811.6221346
1978	43998164.2777867
1979	58751511.1566389
1980	56650156.3531796
1981	55348471.7868271
1982	50172971.8983546
1983	48507725.0079522
1984	39530437.0655259
1985	41655579.6273684
1986	52962668.855861
1987	59364700.0544312
1988	78229057.0536806
1989	92561980.5113192
1990	123798544.366234
1991	151210328.335198
1992	205142447.454004
1993	239573947.242324
1994	306986191.028243
1995	410695632.390092
1996	472056866.825328
1997	504234145.093362
1998	505193983.062956
1999	516637921.79007
2000	528877032.570327
2001	496763095.380999
2002	488116687.022919
2003	563669980.302334
2004	625902515.47782
2005	644151247.929597
2006	681901650.191285
2007	792362747.991811
2008	1108461357.91694
2009	1202093937.10694
2010	1524088568.87867
2011	1822220544.50295
2012	1947427631.71159
2013	1966099392.31077
2014	1985095853.01327
2015	1736059023.22586
2016	1655834909.70613
2017	1752157449.18778
2018	1828007120.3877
2019	1778607216.50661
2020	1373206757.5073
2021	1356828951.05265