Year	current US$
1971	1279999.993741512
1972	3759999.9066442233
1973	5239999.972283836
1974	9680000.057443978
1975	15820000.47899785
1976	22749999.89010394
1977	19259999.951347716
1978	18720000.153407454
1979	25719999.607652396
1980	36169999.785721324
1981	38650000.475347005
1982	42940000.155940644
1983	56200000.61392791
1984	61939999.988302544
1985	69480001.69545408
1986	111370001.70722593
1987	144799999.55371028
1988	224530000.8431076
1989	233039999.34345496
1990	221550000.2615152
1991	237300001.27665716
1992	171899999.63156873
1993	74339999.56771734
1994	85160000.50306332
1995	73550000.2652407
1996	70509998.95855783
1997	63300000.16465783
1998	76919999.64788549
1999	77130000.03807245
2000	71970000.51662323
2001	74140000.08441512
2002	81879999.9784677
2003	104799999.54253432
2004	129120000.03829595
2005	152139998.52351844
2006	180430000.74475992
2007	238360001.0629744
2008	258080001.6634166
2009	305230003.3867359
2010	309959996.57362694
2011	308439999.20785415
2012	297250004.13134706
2013	323789999.37884504
2014	345740000.49009913
2015	260520001.14880508
2016	216919999.73543003
2017	174839999.59193167
2018	150170001.48631635
2019	199790000.3679096
2020	231809999.8254329
2021	234359998.82966295
2022	191969998.3149767