Year	current US$
1970	407754800
1971	453197863.636363
1972	553854090.909092
1973	686598418.60465
1974	891237558.139534
1975	1212844651.16279
1976	1260339047.65618
1977	1415649209.30233
1978	1568245352.86549
1979	1925043194.39963
1980	2140038418.60465
1981	2876762000
1982	2780683255.81395
1983	3206720674.4186
1984	2491565176.17
1985	2449031133.33333
1986	2116544444.44444
1987	1995631482.75862
1988	2221305724.13793
1989	1481717602.27089
1990	1243435780.38379
1991	1880449400.85725
1992	2698186289.47368
1993	2392318166.29956
1994	2826785757.57576
1995	3395892064.47964
1996	2995880411.86894
1997	3629807605.49514
1998	3867294420.01236
1999	4086474192.54926
2000	4763007227.37921
2001	4829931722.96102
2002	3494594112.37388
2003	3059844590.72175
2004	3964484119.54853
2005	5043312390.0275
2006	6204127924.54589
2007	8124548555.9851
2008	15879137120.9323
2009	21393852531.2879
2010	25397529620.0457
2011	20175451700.5572
2012	24277015513.6735
2013	23495760137.1791
2014	31191474610.3879