Year	constant 2015 US$
1960	5193140000
1961	6827910000
1962	7218630000
1963	7012830000
1964	7568850000
1965	7862740000
1966	8141890000
1967	8817360000
1968	7847100000
1969	7283890000
1970	7224390000
1971	7701100000
1972	7371070000
1973	7970440000
1974	10368320000
1975	11926140000
1976	10811740000
1977	11813460000
1978	13870360000
1979	15607070000
1980	16483520000
1981	17135560000
1982	18550780000
1983	18213530000
1984	20947070000
1985	22685900000
1986	21826790000
1987	21649030000
1988	22828520000
1989	24643170000
1990	24865530000
1991	24218870000
1992	24773610000
1993	23320310000
1994	24883520000
1995	21590720000
1996	19445010000
1997	19382800000
1998	19031590000
1999	17395580000
2000	18215510000
2001	20514410000
2002	26243970000
2003	29801830000
2004	28748380000
2005	34505030000
2006	42036080000
2007	34266600000
2008	36647120000
2009	41790520000
2010	41685900000
2011	42255300000
2012	42778940000
2013	43277880000
2014	41901440000
2015	45606520000
2016	44245710000
2017	48452490000