Year	constant 2015 US$
1960	5150000
1961	13210000
1962	22570000
1963	44980000
1964	21570000
1965	33840000
1966	26180000
1967	22560000
1968	42280000
1969	25510000
1970	8910000
1971	19810000
1972	25690000
1973	30250000
1974	42910000
1975	30040000
1976	39630000
1977	69470000
1978	95670000
1979	82730000
1980	115520000
1981	157830000
1982	108520000
1983	94550000
1984	125530000
1985	115740000
1986	203720000
1987	175430000
1988	134430000
1989	162940000
1990	138590000
1991	138430000
1992	141190000
1993	111810000
1994	85600000
1995	53290000
1996	43740000
1997	50460000
1998	51420000
1999	44010000
2000	67200000
2001	73390000
2002	85270000
2003	73900000
2004	67070000
2005	64540000
2006	77720000
2007	90980000
2008	87060000
2009	116610000
2010	111010000
2011	116470000
2012	124540000
2013	100330000
2014	88490000
2015	106000000
2016	91720000
2017	265570000