Year	current US$
1975	4071592714.31229
1976	3778653414.37346
1977	3265911161.1932
1978	3653057314.09007
1979	5530920372.74986
1980	6859368456.96431
1981	6035697583.33609
1982	5467357030.73181
1983	4990417124.10288
1984	5589788228.15561
1985	5352209226.74994
1986	6845182400.01923
1987	7791686604.6887
1988	11685406945.5531
1989	11866723247.4029
1990	9970573405.19027
1991	-1996174958.80101
1992	-4546077253.75688
1993	-2840617563.76384
1994	792034068.257004
1995	7676446794.43966
1996	7070796977.16117
1997	11579131721.5388
1998	14565702484.0229
1999	16668901979.3934
2000	18061008655.4348
2001	19323564775.1348
2002	19360368456.1527
2003	18510525447.523
2004	24316178908.6015
2005	22520381346.2247
2006	24227255964.5725
2007	32457076486.1091
2008	29545792845.125
2009	10978698569.6955
2010	12579371943.5845
2011	11980109152.3409
2012	6005117267.1982
2013	3043574056.94566
2014	4243876436.94792
2015	4573563447.37553
2016	6158788001.21278
2017	12172428204.8172
2018	13393730936.5507
2019	13052527242.2577
2020	15438287010.8643
2021	18643972223.3986