Year	current US$
1970	11902079.6810093
1971	9063216.35630653
1972	9328995.64680909
1973	26177091.1566544
1974	27957643.6869494
1975	10175695.2338348
1976	15106161.5200224
1977	10998261.0884471
1978	8648314.21962587
1979	17833515.2493672
1980	19119336.7540091
1981	11283480.6245973
1982	8804500.40202978
1983	8347325.81687771
1984	5705338.14899618
1985	5018796.85390229
1986	3251012.08862175
1987	7134510.87684158
1988	20471780.0422542
1989	21310407.5159629
1990	17975529.8950645
1991	12794976.8191557
1992	14940371.5718437
1993	6930378.84740896
1994	9426468.52320348
1995	7761280.84350007
1996	5048929.71047977
1997	3901112.40540309
1998	1189098.58479933
1999	591392.001352777
2000	764077.643881665
2001	313974.752876355
2002	205465.13475305
2003	101681.489886584
2004	193727.752997117
2005	1443915.37334189
2006	3355750.588873
2007	5839454.28443402
2008	15276414.8117534
2009	3754977.15570051
2010	29507899.5042189
2011	42127156.5293709
2012	35789484.5237765
2013	37753720.6610264
2014	23236500.3343329
2015	7891371.72946487
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0