Year	current US$
1971	1592718.9988623436
1972	1552609.5784067835
1973	2125850.3401360544
1974	3725462.100587477
1975	2749169.685298619
1976	3055177.731909376
1977	3770166.2310646176
1978	4463989.341366988
1979	7621563.944921498
1980	8194479.09022001
1981	10342854.12208705
1982	11636240.814578047
1983	9838423.484055659
1984	11619553.824835226
1985	11345471.637333896
1986	11312087.281079529
1987	11580937.776420012
1988	16566491.413995659
1989	16396001.817514246
1990	16648324.510248607
1991	17460171.28649047
1992	23906287.35357399
1993	33440692.805827837
1994	27496249.268539008
1995	27599166.152852405
1996	28095889.419962887
1997	28652585.9160568
1998	23423634.072998263
1999	25815695.364046775
2000	18550064.836799715
2001	-7119667.827778973
2002	5978821.035886233
2003	9499138.282939494
2004	11009060.56372803
2005	11221968.816738343
2006	11525130.962021211
2007	14205436.48719289
2008	15720354.257795999
2009	15878253.645356536
2010	15996030.008552296
2011	24459320.119891237
2012	30209907.19086883
2013	31346996.46062419
2014	29883347.829830334
2015	28731387.92945623
2016	30082460.66727704
2017	30440995.0566664
2018	38126351.38236316
2019	36227278.27186707
2020	31180704.05080081
2021	34109151.52644991
2022	34614554.12640922