Year	constant 2015 US$
1960	30160000
1961	39410000
1962	39420000
1963	62920000
1964	85860000
1965	79440000
1966	67230000
1967	69340000
1968	113680000
1969	106900000
1970	109910000
1971	77830000
1972	78010000
1973	63530000
1974	103130000
1975	177490000
1976	130990000
1977	175420000
1978	249760000
1979	239420000
1980	232560000
1981	251830000
1982	361670000
1983	430980000
1984	644500000
1985	573470000
1986	525400000
1987	442070000
1988	521250000
1989	407770000
1990	671020000
1991	433150000
1992	495040000
1993	448730000
1994	372330000
1995	457940000
1996	414100000
1997	376940000
1998	423030000
1999	1059960000
2000	614450000
2001	907300000
2002	552950000
2003	464520000
2004	722000000
2005	727610000
2006	619350000
2007	443440000
2008	518780000
2009	433890000
2010	599720000
2011	547140000
2012	512140000
2013	567340000
2014	551250000
2015	541420000
2016	412400000
2017	432030000