Year	current US$
1970	256174560.404024
1971	229790970.105457
1972	236662243.164394
1973	406680256.856058
1974	487869258.620128
1975	1053657378.9249
1976	697977529.028899
1977	2202888413.68649
1978	2222817358.52228
1979	1032555909.4893
1980	1238378151.68064
1981	1102876122.58557
1982	1675152556.85271
1983	1171331395.99101
1984	989909233.659028
1985	730508768.282858
1986	1331903806.4381
1987	1239760556.03189
1988	1315291213.05754
1989	1311475907.83526
1990	1725514337.55749
1991	1685805419.23894
1992	1759507906.87413
1993	1732585903.24045
1994	1471673022.16889
1995	1764082535.0446
1996	1645223490.12582
1997	1575631747.79116
1998	1527965205.50437
1999	1768889510.90862
2000	1589403145.29979
2001	1593347627.48201
2002	1913889068.86223
2003	2061824827.29274
2004	1721809752.91273
2005	1738631013.39135
2006	2651990439.03782
2007	3671592938.97594
2008	3588356499.37143
2009	3478216696.5645
2010	6309659253.99026
2011	6410078914.7224
2012	5657135959.42675
2013	5192802318.99555
2014	5404322257.59014
2015	6205681999.51733
2016	6837083487.00414
2017	5483081651.43331
2018	4022909294.65037
2019	4414061994.92499
2020	4968812968.63129
2021	5105130334.21007