Year	current US$
1968	35140000.268816896
1969	30240000.2218783
1970	35319999.5905161
1971	38600000.5379319
1972	32159999.6834993
1973	45900000.0059605
1974	38400000.0618398
1975	61280000.3662705
1976	50910000.0113249
1977	36799999.974667996
1978	44070000.4994869
1979	86980000.27984379
1980	163859996.09530002
1981	70609999.5970726
1982	64260000.206530094
1983	71960000.1983345
1984	61310000.3786385
1985	65779999.464750305
1986	88969999.7752905
1987	96080000.8177757
1988	120809999.730438
1989	116600000.485778
1990	54099999.6289611
1991	56489999.9499321
1992	60860000.103712104
1993	59590000.1600385
1994	27579999.9386072
1995	30379999.8387694
1996	39010000.4505366
1997	38299999.4177371
1998	37849999.9325722
1999	19930000.2027303
2000	18569999.9369681
2001	9069999.99843538
2002	13250000.0782311
2003	15799999.952316301
2004	18529999.9974668
2005	21000000.2607703
2006	23749999.9701977
2007	19869999.945163697
2008	24669999.986887
2009	29910000.2869964
2010	29629999.961704
2011	22730000.2183765
2012	23321241.0248816
2013	20182601.276785098
2014	17638002.0549987
2015	17780769.140692398
2016	14013713.4788092
2017	11723474.7800976
2018	10121038.813144
2019	13337526.6566873
2020	12497275.7771611
2021	16146203.946322199
2022	16037460.859864943