Year	current US$
1968	13260000.1432002
1969	12920000.130310701
1970	17040000.3287941
1971	20259999.8358637
1972	24290000.1145899
1973	25399999.4378537
1974	27150000.097230103
1975	38430000.178515896
1976	27850000.159815
1977	25929999.936372
1978	48259999.517351404
1979	50099999.2899597
1980	90449999.1498888
1981	94860000.9977818
1982	82479999.3336201
1983	79100000.359118
1984	70480001.0547042
1985	80930000.5882978
1986	91750000.782311
1987	114439999.230206
1988	127260000.556707
1989	126289999.477565
1990	141980000.61512
1991	136359999.492764
1992	115529998.973012
1993	104819999.855012
1994	96219999.8125434
1995	104759999.804199
1996	89240000.8086115
1997	109120001.707226
1998	84019999.621436
1999	73740000.1175702
2000	61759999.0442395
2001	51209999.8109043
2002	38639999.6653199
2003	36490000.087767795
2004	51980000.436306
2005	60979999.8998642
2006	63980000.6840378
2007	63429999.6420741
2008	61679999.8488277
2009	62180000.7373095
2010	63709999.604150705
2011	52499999.5809048
2012	55268393.1944466
2013	49121058.135235205
2014	48882411.307655305
2015	42907288.5080859
2016	34215515.431948
2017	29783422.417564
2018	20336227.8463319
2019	22869530.9292525
2020	21020766.299217902
2021	22182662.0055363
2022	24028249.725699432