Year	current US$
1972	5690000.044181944
1973	5840000.031515953
1974	9399999.944493165
1975	17339999.960735448
1976	13040000.006556522
1977	10120000.18171966
1978	10379999.989643693
1979	8440000.03114342
1980	8060000.043362392
1981	8229999.925941223
1982	7390000.078827139
1983	6009999.921545385
1984	5320000.065490597
1985	3500000.050291415
1986	4710000.105202192
1987	5269999.895244831
1988	5469999.872148031
1989	5439999.984577294
1990	11319999.998435367
1991	5519999.915733939
1992	5849999.887868756
1993	7689999.9845773
1994	9270000.131800774
1995	12919999.998062856
1996	13699999.991804358
1997	17540000.11831522
1998	13899999.935179956
1999	16159999.994561074
2000	13100000.048056247
2001	13109999.939799305
2002	16139999.972656377
2003	26310000.529512756
2004	24880000.028759237
2005	31269999.898970112
2006	27609999.91372229
2007	36849999.815225594
2008	32689999.490976278
2009	21769999.78907406
2010	23349999.794736512
2011	36439999.72194433
2012	31860000.126063846
2013	32869999.982416615
2014	36369999.60429966
2015	29389999.79570508
2016	29629999.831318863
2017	32690000.00692908
2018	39619999.45342541
2019	32170000.109821554
2020	33680000.11518593
2021	26450000.572949674
2022	21089999.577030532