Year	current US$
1970	7871332.01650475
1971	8360257.62895302
1972	8445298.85814092
1973	11265883.4453289
1974	11724356.696169
1975	15822130.1386898
1976	16216550.6245017
1977	17734207.3134248
1978	18353355.5692539
1979	27544552.7461731
1980	29585693.9600416
1981	30716610.4776222
1982	25936725.2347262
1983	23327673.2219615
1984	18103018.7033228
1985	24713950.5787521
1986	24417031.289389
1987	29422037.773436
1988	28830869.3683528
1989	28152732.4081878
1990	31202015.6325753
1991	31308901.4958515
1992	32117839.1000402
1993	27721406.6709375
1994	14116426.3559008
1995	17510283.7328538
1996	15571313.2153974
1997	14550128.6343499
1998	14969978.5300914
1999	15689420.1570425
2000	14343345.3260426
2001	14720996.5698448
2002	15754913.5364278
2003	18242436.7064663
2004	20204836.1178879
2005	21375465.99085
2006	20305285.0786792
2007	21958339.6635047
2008	25024497.6990135
2009	25356817.9485614
2010	24750699.063429
2011	28148678.24106
2012	28995504.9260973
2013	19627155.2459245
2014	22016945.6927523
2015	19744122.4179088
2016	21249490.8521789
2017	25046257.1005799
2018	27447570.463942
2019	27439270.4991031
2020	28253062.0665721
2021	30914324.1260583