Year	constant 2015 US$
1960	29550000
1961	33110000
1962	124420000
1963	74410000
1964	63690000
1965	81600000
1966	99690000
1967	105030000
1968	150900000
1969	168620000
1970	164270000
1971	173690000
1972	205890000
1973	233560000
1974	258790000
1975	310530000
1976	388600000
1977	336510000
1978	356090000
1979	411330000
1980	414970000
1981	374530000
1982	354830000
1983	375520000
1984	327940000
1985	320860000
1986	328260000
1987	448100000
1988	372200000
1989	340120000
1990	371430000
1991	340010000
1992	395530000
1993	492670000
1994	842290000
1995	654570000
1996	607130000
1997	524450000
1998	601890000
1999	534490000
2000	588020000
2001	673870000
2002	572990000
2003	605910000
2004	591460000
2005	719340000
2006	745460000
2007	724860000
2008	712110000
2009	805700000
2010	845750000
2011	903060000
2012	899490000
2013	930360000
2014	810440000
2015	954000000
2016	782140000
2017	966550000