Year	current US$
1990	4009153285.7541394
1991	3684349263.343878
1992	3579432646.7840867
1993	4941354272.760128
1994	4655995958.296973
1995	2977436056.8702245
1996	3754578754.5787544
1997	3656160358.9763618
1998	2987762364.887697
1999	3311693771.8165374
2000	4453425486.6358185
2001	3566564859.254558
2002	2650393700.7874017
2003	2350386328.125
2004	4624318461.538462
2005	7179699935.416564
2006	12610652480.41219
2007	14081313433.30865
2008	19127105941.50521
2009	15225275102.230974
2010	16432176155.618656
2011	8378779759.376287
2012	14747475548.08744
2013	12628450914.215076
2014	13311830695.016197
2015	8327987778.831604
2016	9699655271.370407
2017	10868189579.716175
2018	12326744895.664143