Year	current US$
1975	1018061714.90724
1976	1505176350.96562
1977	1915807907.39513
1978	2288662374.77475
1979	2783553334.65961
1980	3581042656.70134
1981	4233704762.14061
1982	5670488150.36775
1983	6890919492.32108
1984	7234005728.52404
1985	6954196029.73876
1986	6237884222.53379
1987	5565226009.53342
1988	5989446724.5727
1989	6210306863.266
1990	6574014617.62199
1991	7004710379.37293
1992	6947619801.21314
1993	8749574136.4585
1994	8680000880.22822
1995	8674540397.93445
1996	9091195845.97561
1997	9008368216.91611
1998	8957545785.4635
1999	9135401045.92293
2000	8877867146.7929
2001	8738190412.60488
2002	9231931933.90203
2003	9519162556.42958
2004	10270932607.2158
2005	19463025841.5629
2006	22069979577.9441
2007	24835942818.2437
2008	30527175201.6002
2009	27571944086.5776
2010	13823863759.2864
2011	14450610791.9986
2012	15422965764.4939
2013	14077821530.858
2014	15689211044.8697
2015	17449648371.0611
2016	17125054417.5325
2017	16814716427.8327
2018	18542795468.4242
2019	18710750977.8133
2020	18369121204.5343
2021	22040281232.4663