Year	current US$
1971	12082.2917960393
1972	15512.0599930867
1973	19474.1109485356
1974	30158.9559451239
1975	81502.0640646858
1976	55294207.5639521
1977	60804023.7179404
1978	40495265.0205753
1979	129275228.266463
1980	98477693.4236795
1981	70087466.3200626
1982	29856455.6702923
1983	70892931.4657188
1984	115552230.317055
1985	132706166.424433
1986	44055291.8088029
1987	90130717.6233149
1988	68737918.909435
1989	111862522.64301
1990	165997334.743285
1991	89935336.381832
1992	66926039.7492883
1993	60784409.11937
1994	56038292.1415855
1995	73790921.5381956
1996	93535816.5602625
1997	80398709.709877
1998	35142280.279939
1999	58118879.5385314
2000	112764057.988113
2001	89323808.9277622
2002	86661187.0493835
2003	100882076.876668
2004	160234642.483559
2005	224755762.722744
2006	261667854.297836
2007	300949780.963544
2008	388481916.835224
2009	175888548.088299
2010	266069466.404092
2011	444258928.605036
2012	422166875.214466
2013	350110196.741866
2014	254354521.761807
2015	87341202.3478301
2016	74391409.2954228
2017	175729133.368261
2018	257242206.56857
2019	226315578.39362
2020	119361804.714432
2021	240724609.388217