Year	current US$
1975	8160135623.701075
1976	9103004658.879774
1977	7852641969.91522
1978	9266576589.40202
1979	17414225360.78025
1980	19869257730.00002
1981	17865741528.171307
1982	10402866505.547539
1983	10692540342.94684
1984	11557409544.18369
1985	9479806329.607347
1986	10104541983.76282
1987	11697249060.320906
1988	10142817878.122114
1989	12596887192.864988
1990	3627265566.167648
1991	-26010258127.593933
1992	4547585639.99074
1993	7468177215.8690195
1994	7805743915.095495
1995	10252370901.971296
1996	12572432189.880291
1997	12934605854.724398
1998	7001664810.309272
1999	9446641368.038555
2000	18695881966.566734
2001	13313462501.843666
2002	10786605878.637283
2003	17381511014.48057
2004	28967763827.621307
2005	47561301369.863014
2006	67926020162.39876
2007	65626251924.40202
2008	86219827991.97871
2009	45488434981.1209
2010	59461630750.8704
2011	88413417501.27357
2012	99103955085.3981
2013	95981169217.42029
2014	81601428398.46777
2015	35427728298.44438
2016	27846417483.126335
2017	42834376584.234024
2018	54870365073.8523
2019	48152935843.740105