Year	constant 2015 US$
1960	1195265000
1961	1139152000
1962	861895000
1963	1324135000
1964	1054732000
1965	2105400000
1966	2344980000
1967	3001139000
1968	2611560000
1969	3023481000
1970	2972572000
1971	3063368000
1972	3064072000
1973	3964699000
1974	3929127000
1975	3800068000
1976	3383697000
1977	3700504000
1978	4311366000
1979	5298146000
1980	6489768000
1981	5787114000
1982	6135097000
1983	7210667000
1984	8141538000
1985	7116147000
1986	7327564000
1987	8202213000
1988	9010050000
1989	9319516000
1990	9672983000
1991	10575393000
1992	9984330000
1993	8809200000
1994	9508764000
1995	9652307000
1996	7311207000
1997	8013312000
1998	9862014000
1999	9935675000
2000	10575679000
2001	8794388000
2002	8677800000
2003	7818266000
2004	7427705000
2005	11269825000
2006	10223093000
2007	7218483000
2008	8012069000
2009	7165050000
2010	8037689000
2011	7457058000
2012	7209685000
2013	9587942000
2014	8458724000
2015	9202640000
2016	9330520000