Year	current US$
1970	15939999.748021364
1971	17960000.216960907
1972	17280000.030994423
1973	16729999.73967671
1974	16489999.82886016
1975	26479999.944567673
1976	20929999.63462354
1977	22719999.60392713
1978	29130000.066012166
1979	37200000.092387155
1980	46369999.349117205
1981	54870000.06437301
1982	50180001.22904782
1983	41450000.50961976
1984	38039999.57442284
1985	40869999.93026257
1986	45350000.52303076
1987	41059999.704360925
1988	46339999.67575073
1989	46310000.18119812
1990	62060000.76979401
1991	67260000.31828885
1992	56520001.25497577
1993	46590000.089257985
1994	38060000.30785798
1995	30069999.732077133
1996	38089999.09646808
1997	57980001.2558699
1998	38809999.605640784
1999	25500000.100582838
2000	23230000.10102987
2001	28870000.416412953
2002	34699999.81299046
2003	30220000.319182865
2004	31639999.821782116
2005	45510000.44122341
2006	50759999.83027579
2007	51419999.98688699
2008	55509999.63283536
2009	63449999.41065912
2010	69030000.0011921
2011	50540000.40888786
2012	53372600.95775129
2013	47402884.081006065
2014	43957164.54088692
2015	38368896.001251414
2016	37060347.29629756
2017	28234005.834907297
2018	13715200.401842583
2019	23366881.93678855
2020	24598290.93515873
2021	27369184.795767076
2022	29631818.52921843