Year	current US$
1971	264615.32463468
1972	351079.748395343
1973	425372.888627925
1974	636166.795821117
1975	1240693.34762946
1976	1190531.86937431
1977	1115658.3580544
1978	1035262.52027683
1979	853056.045597059
1980	1275645.77802164
1981	1688696.50884046
1982	2088753.55566339
1983	969339.350321625
1984	877505.802692017
1985	978895.938849918
1986	817564.400522353
1987	495855.779719939
1988	713210.918764523
1989	664308.522234178
1990	647006.318133491
1991	576074.105414742
1992	628434.818007062
1993	357888.221645461
1994	184275.597133493
1995	247124.92729614
1996	181437.758605377
1997	89767.2914131682
1998	159365.37685852
1999	105710.407823713
2000	159211.936845814
2001	291153.518867246
2002	199847.935202888
2003	238736.501877419
2004	386261.247639461
2005	386814.622228568
2006	180018.860053771
2007	55922.2161487831
2008	8606.79478129339
2009	2890.20350642398
2010	5257.49191373694
2011	6742.19627104141
2012	555411.219367248
2013	551520.583183534
2014	428487.537426792
2015	312165.921123026
2016	702222.16040381
2017	2279218.39089086
2018	3952324.63159044
2019	2454692.0402069
2020	2294123.40103708
2021	4666336.79412691