Year	current US$
1970	217944562.899786
1971	265169720.347155
1972	316289716.22605
1973	336405977.646365
1974	395682012.330646
1975	445925718.29012
1976	436503456.221199
1977	393545389.954637
1978	402236769.267478
1979	416127309.351347
1980	481581105.136288
1981	453645096.24198
1982	485353539.587492
1983	348876519.969473
1984	384080397.129044
1985	339030290.695702
1986	354750918.306899
1987	441751651.20524
1988	619349526.765872
1989	649630448.929247
1990	536786992.431393
1991	586562072.096441
1992	547920886.851895
1993	520322257.468589
1994	529319871.459299
1995	570018888.684769
1996	545787656.532579
1997	650965609.538922
1998	540200778.654891
1999	518610723.800981
2000	550731198.498653
2001	632887845.562329
2002	656782850.517492
2003	756251647.370481
2004	960920597.688957
2005	1258096564.17291
2006	1939182468.85418
2007	2160492779.26492
2008	2769473891.91088
2009	2379363541.86925
2010	3243611556.3428
2011	3706988042.74816
2012	4008532761.0694
2013	4231169461.81179
2014	4158008757.84563
2015	3386882225.59295
2016	3345222782.02283
2017	4218184046.27679
2018	4393922751.88646
2019	4029652800.2658
2020	3399467508.958
2021	4000558127.53829