Year	constant 2015 US$
1960	202390000
1961	327840000
1962	331960000
1963	335830000
1964	275970000
1965	379260000
1966	242910000
1967	221030000
1968	451580000
1969	440250000
1970	434290000
1971	477300000
1972	441920000
1973	320050000
1974	516320000
1975	480780000
1976	671990000
1977	538090000
1978	758250000
1979	736410000
1980	711870000
1981	914380000
1982	910580000
1983	644970000
1984	656130000
1985	683670000
1986	669270000
1987	622820000
1988	615410000
1989	783340000
1990	898500000
1991	608340000
1992	556980000
1993	550000000
1994	547780000
1995	540300000
1996	570500000
1997	661330000
1998	362860000
1999	316370000
2000	323360000
2001	406640000
2002	323950000
2003	230240000
2004	351760000
2005	364800000
2006	382990000
2007	459530000
2008	468970000
2009	611680000
2010	550450000
2011	363960000
2012	274680000
2013	313320000
2014	332500000
2015	198040000
2016	189800000
2017	214330000