Year	current US$
1970	7381607.57769424
1971	10015386.8603366
1972	12511532.7572687
1973	18602198.6776832
1974	91205185.8910537
1975	114453011.960886
1976	86392027.7839206
1977	127281782.793302
1978	172197236.297924
1979	501170967.685034
1980	610804272.00973
1981	459601366.984531
1982	348164964.363409
1983	386599085.484189
1984	465867311.26222
1985	450715678.342557
1986	215222216.659702
1987	274525467.222821
1988	217943752.09985
1989	307523208.429688
1990	354611345.051374
1991	464387551.382941
1992	498970624.334617
1993	411474033.574603
1994	352195157.561083
1995	361352326.170733
1996	454443473.311383
1997	396068964.75524
1998	273256595.250311
1999	400680082.770893
2000	571216205.203399
2001	416485696.721498
2002	437689985.392583
2003	412520381.295563
2004	567952985.569694
2005	916821997.302843
2006	1013583844.42956
2007	1664294627.70351
2008	2054276559.64409
2009	1299427114.34501
2010	1574290180.27675
2011	1915506173.01649
2012	1894781158.88852
2013	1606018474.32669
2014	1302821385.96875
2015	569310343.663937
2016	416008217.713224
2017	432663157.373765
2018	586701312.986067
2019	464950788.589229
2020	278591456.016767
2021	529385779.919302