Year	current US$
1974	553561088.3414713
1975	804284308.0461247
1976	954545164.5407307
1977	1138101042.4047844
1978	746670815.8889655
1979	1512159814.506414
1980	2312102489.1141043
1981	3048928777.3228693
1982	2509843947.569328
1983	2609438620.3118224
1984	2944439304.0409603
1985	2775662357.590585
1986	1305035654.9109282
1987	2233290247.074122
1988	1796618985.6957097
1989	2468140182.0546165
1990	2557830949.2847857
1991	1592173732.1196349
1992	1585195578.6736035
1993	1063320676.202857
1994	1375095448.6345909
1995	1371977633.2899816
1996	2381209120.553969
1997	2569833439.540958
1998	1703583234.5052001
1999	2943254105.579979
2000	6129521976.592978
2001	5308654096.2288685
2002	5528091547.464235
2003	6474835370.611186
2004	7790952665.799735
2005	11839875422.626791
2006	15771729258.77763
2007	16807399739.921978
2008	27249067620.286087
2009	13146593498.049414
2010	25998918595.57868
2011	30383355006.50195
2012	34243953185.955788
2013	34313526657.997395
2014	31042470741.222378
2015	17678283485.045467
2016	14565409622.88689
2017	16629388816.644999
2018	25006148244.473335
2019	19639287386.215866
2020	8536637711.313393
2021	15443393749.958857