Year	current US$
1968	108510000.33319001
1969	60870000.530034296
1970	74019999.6829033
1971	84870000.2580881
1972	91180000.3573298
1973	91199999.384582
1974	89319999.86059959
1975	132230000.40836601
1976	121290000.224486
1977	123829999.141395
1978	169409999.836236
1979	198380000.71421298
1980	248549999.535084
1981	289500002.413988
1982	262929999.60482097
1983	227450001.70916298
1984	222779997.792095
1985	241349999.025464
1986	278980001.978576
1987	287470000.86307496
1988	317330001.950264
1989	340269999.53389204
1990	336209997.206926
1991	343010001.093149
1992	303520001.132041
1993	269170002.413914
1994	213569999.03731
1995	203360000.059009
1996	202820000.337437
1997	269960001.81324804
1998	227760000.854731
1999	196560001.291335
2000	172409997.89536
2001	144240000.9837
2002	141830000.44152102
2003	143569999.82520902
2004	169870000.451803
2005	183650000.602007
2006	203150000.721216
2007	208689999.25255802
2008	230339999.049902
2009	242220000.013709
2010	252290000.43868998
2011	197829998.880625
2012	196092119.565001
2013	183541108.995676
2014	182159336.574376
2015	161244964.631274
2016	131344020.97389099
2017	115730555.587539
2018	78970937.2911602
2019	109185377.47860001
2020	113806665.45033501
2021	129413123.324513
2022	127665007.21871851