Year	current US$
1970	188077700.159149
1971	195199340.74358
1972	255058630.999213
1973	299449457.842948
1974	324987193.886945
1975	501556673.62424
1976	363913484.290971
1977	509063981.316114
1978	638102857.142859
1979	851969084.461639
1980	1030715856.93478
1981	1056198104.95627
1982	1047761010.50749
1983	1041501928.15895
1984	1005721647.60116
1985	1051367272.42442
1986	1430219266.63841
1987	1789380505.61798
1988	1863092244.75105
1989	1840284819.73435
1990	2200540961.31301
1991	2370627201.16618
1992	2731834045.2901
1993	2620640848.93592
1994	2920856042.40283
1995	3287883838.38384
1996	3553741179.43548
1997	4237785516.10793
1998	3601985856.7958
1999	3743473873.01093
2000	3721376849.60841
2001	3932453781.84635
2002	4765432187.25354
2003	6473639694.87894
2004	8220949677.76628
2005	8862800552.51519
2006	9793601843.44123
2007	11558069590.1118
2008	13590717268.6449
2009	13372379980.9103
2010	12404523063.7983
2011	12976875129.6094
2012	12299384921.3931
2013	11990310178.239
2014	11855563519.9697
2015	10211841587.3169
2016	10363701041.9901
2017	11182321908.3878
2018	12406015508.2274
2019	12343974682.7625
2020	12758455763.7722
2021	15226469271.0911