Year	current US$
1974	415448.457
1975	466609.2396
1976	711447.1793
1977	325628.4893
1978	398838.9373
1979	47009.971
1980	378646.7016
1981	220807.0755
1982	114372.0374
1983	116157.7329
1984	5636074.543
1985	4573740.005
1986	5869821.548
1987	4648277.283
1988	4029545.307
1989	9741570.473
1990	7870713.234
1991	13130938.53
1992	15214864.73
1993	13543858.53
1994	12743958.47
1995	9102989.43610931
1996	6241918.029376
1997	12184519.9501134
1998	11462127.2289384
1999	11621994.7404228
2000	11270072.5540781
2001	10871296.0869891
2002	29323596.1441193
2003	16231547.7
2004	11506654.2
2005	101672956.266869
2006	150260189.029423
2007	254488696.945114
2008	313991941.099283
2009	283721276.649106
2010	455825544.213646
2011	335015246.964639
2012	330495619.941639
2013	357754330.944225
2014	344438244.030645
2015	326844541.396424
2016	299204626.141945
2017	342776977.918857
2018	425502225.716378
2019	407676204.197602
2020	495356527.446368
2021	439712454.828004
2022	385290310.633864
2023	380000000