Year	current US$
1971	2679188200.80712
1972	2077122062.86934
1973	3539876429.72274
1974	3880238984.45096
1975	3281115010.89731
1976	3393734944.38837
1977	3818084012.24677
1978	4552127256.24743
1979	6714805665.89427
1980	9203584924.49977
1981	10388031369.2216
1982	8477695538.88315
1983	4600242444.46099
1984	4298183252.80984
1985	4210286916.53816
1986	5456824048.41868
1987	6980946195.46539
1988	7780072129.00768
1989	7960956448.60486
1990	8788558395.16771
1991	10780303554.1548
1992	12537970059.0511
1993	14624192052.2332
1994	17054256977.2738
1995	18776780019.1941
1996	20045656784.1687
1997	23505278083.4066
1998	24869884096.574
1999	23480149673.2041
2000	22241204165.1871
2001	20317738775.609
2002	13261092824.443
2003	11190022648.7965
2004	12724719819.487
2005	16453137930.527
2006	18703936864.6517
2007	22425309075.6796
2008	28829964738.3402
2009	29681897235.4594
2010	37529747665.0156
2011	44503992102.9346
2012	44924232763.6895
2013	51418560440.5683
2014	50381478532.9751
2015	47804269388.5369
2016	51033428049.7018
2017	56662079899.0801
2018	56354808943.293
2019	54062376813.4075
2020	46847647419.1555
2021	49994553832.2173