Year	current US$
1970	642513258.843377
1971	820755153.119127
1972	1336602975.37587
1973	2442329230.40725
1974	2025807304.59682
1975	2340599283.11825
1976	2582259119.44869
1977	3129437317.59082
1978	3180926122.86332
1979	4921025888.84875
1980	5678451649.88896
1981	4048274185.50595
1982	6387699358.81772
1983	6080056851.10272
1984	3817004197.6706
1985	3392113412.96763
1986	4393069060.92968
1987	6275582737.2726
1988	6405020329.26997
1989	7387746000.78056
1990	6651113774.47566
1991	7154164849.64177
1992	8323388269.03471
1993	7898419954.13973
1994	7862233062.33158
1995	8279252047.29278
1996	7446850745.14972
1997	5891027391.7145
1998	4309996426.36914
1999	3827778485.06821
2000	3992004210.17081
2001	3571437491.57679
2002	3564567215.65961
2003	5432953693.5833
2004	3615629556.07911
2005	4808704970.52471
2006	6117037111.52934
2007	8738498291.24933
2008	9507449666.17558
2009	7100382258.9593
2010	7486988448.22624
2011	6756708750.05042
2012	7191506231.03532
2013	6824492612.32035
2014	8469379174.85448
2015	5340346360.32619
2016	4857633623.77461
2017	6431490104.53808
2018	7101758439.28425
2019	6536045249.56767
2020	6280445749.10215
2021	6355359642.27765