Year	current US$
1968	5711844444.444445
1969	6224755555.555556
1970	6675977777.777779
1971	7572181818.181818
1972	8469113636.363636
1973	9723651162.790697
1974	11743930232.55814
1975	14688093023.255814
1976	17411720930.23256
1977	20743418604.65116
1978	23652790697.67442
1979	26536488372.09302
1980	31842348837.2093
1981	37253976744.18604
1982	39593372093.023254
1983	41246232558.139534
1984	22401178147.2684
1985	23617266666.666668
1986	25653884536.082485
1987	18618048275.86207
1988	23989317241.37931
1989	14927844343.021847
1990	15746175226.586092
1991	19278303563.572372
1992	22980834998.893402
1993	24312961012.66191
1994	27424377777.77778
1995	37557149992.2236
1996	29782887610.831535
1997	34630650112.79508
1998	41840625798.734764
1999	44850311610.05407
2000	50468863669.54032
2001	56510579808.87164
2002	40178401240.416916
2003	34722763518.56467
2004	41916663553.78774
2005	51032836463.691826
2006	66692855146.716354
2007	90654278993.94505
2008	122584756597.96698
2009	151415609437.65738
2010	153470301999.1493
2011	122278101321.89401
2012	171099902781.33963
2013	169050464532.32895
2014	249222895674.86713