Year	constant 2015 US$
1960	74620000
1961	149980000
1962	236900000
1963	344090000
1964	261320000
1965	207880000
1966	183610000
1967	169290000
1968	270910000
1969	210540000
1970	178570000
1971	171050000
1972	242100000
1973	134450000
1974	242130000
1975	194500000
1976	219220000
1977	288650000
1978	392680000
1979	379720000
1980	380870000
1981	382140000
1982	339990000
1983	393620000
1984	399040000
1985	456270000
1986	648980000
1987	516930000
1988	671600000
1989	771600000
1990	771860000
1991	694180000
1992	867080000
1993	747220000
1994	711520000
1995	816650000
1996	974840000
1997	911600000
1998	839380000
1999	757330000
2000	675010000
2001	1063890000
2002	949880000
2003	1138360000
2004	861510000
2005	700330000
2006	897630000
2007	481010000
2008	572960000
2009	656180000
2010	658470000
2011	626280000
2012	596630000
2013	621710000
2014	601020000
2015	789090000
2016	696450000
2017	926670000