Year	current US$
1975	1453331.587904176
1976	1593058.7803983868
1977	1964958.9709469948
1978	2636030.674144443
1979	3007377.598926895
1980	3237303.5754953315
1981	2598253.2751091705
1982	2493153.463840146
1983	2400900.900900901
1984	3308468.62659061
1985	2873105.6638033385
1986	3000668.449197861
1987	3346170.0042010923
1988	4774844.057079382
1989	5440603.893524037
1990	5821114.369501466
1991	5887706.308807651
1992	6042610.0512211425
1993	6293352.60115607
1994	15904332.67686714
1995	15781336.061059093
1996	16809805.990746003
1997	16926790.66086268
1998	14156233.24396783
1999	16020501.065552486
2000	18172311.908481985
2001	15174660.496618377
2002	14388109.329647357
2003	15929463.120996363
2004	17687220.481174443
2005	19185504.487283666
2006	20326943.466855157
2007	21071262.007743675
2008	23087760.869885456
2009	20422755.355761
2010	22041679.864754807
2011	24165678.251277115
2012	27548125.82451685
2013	27856068.81639061
2014	27428826.825506743
2015	26336900.45977745
2016	25390035.421894833
2017	27435000.67631054
2018	28349646.09095517
2019	26464423.451902755
2020	27180954.285593078
2021	24347264.933063786