Year	current US$
1977	255581543.348922
1978	152035709.823737
1979	118578268.141209
1980	163015760.638972
1981	153769930.00028
1982	146270668.432411
1983	259339786.42478
1984	450713095.818705
1985	642800923.690026
1986	773935649.83285
1987	708600753.650954
1988	695246135.95402
1989	677269370.733131
1990	776787977.625945
1991	523514294.728139
1992	759827900.566309
1993	713086341.458443
1994	1028688523.04177
1995	1224129974.02472
1996	1012585192.2233
1997	1290281268.72281
1998	1638400914.22696
1999	1383822356.97403
2000	1485591862.99753
2001	1715690817.77528
2002	1390352106.77705
2003	1291865005.31217
2004	1646418043.17597
2005	1623488240.07166
2006	2373744973.4184
2007	3079672970.11882
2008	2995563892.54848
2009	3054773977.48502
2010	3792337847.98428
2011	3440123156.72495
2012	3965715053.18695
2013	4355302176.91149
2014	4341389481.39854
2015	5375969828.01866
2016	6332278983.21444
2017	5373720372.9336
2018	5599797322.62399
2019	5837327406.48572
2020	5359843461.02762
2021	6496988543.90037