Year	current US$
1970	257079.891864276
1971	217015.465623984
1972	249550.040815222
1973	448543.710014215
1974	486065.192980249
1975	733417.70831481
1976	718000.286855002
1977	1438463.15081298
1978	1499181.78896422
1979	1366061.30318709
1980	1728616.8657925
1981	1593776.60682632
1982	2370885.43830212
1983	1519654.7123253
1984	1421936.76437996
1985	1016147.80050407
1986	1728341.30392743
1987	1706316.14603478
1988	1946939.615282
1989	2046761.39431864
1990	3149313.80742835
1991	3191573.3834417
1992	3349332.30376755
1993	2867622.02770639
1994	3484289.56668629
1995	6733762.48922507
1996	6833496.90345728
1997	6416650.87055234
1998	6782197.65453446
1999	4861184.78818265
2000	4914226.08500103
2001	4820086.25195472
2002	5857639.6156258
2003	9052959.7177461
2004	7811018.94823969
2005	8482388.65532452
2006	8837325.23705977
2007	12598571.5092546
2008	15719052.2800018
2009	15835494.506969
2010	14468117.9420838
2011	16712544.4075389
2012	19469012.6600856
2013	20550394.0874721
2014	22726851.0658567
2015	23820011.2702731
2016	25389320.271017
2017	25469090.9842889
2018	18449458.2370791
2019	17764247.3100143
2020	19590945.6486522
2021	21105965.9816943