Year	constant 2015 US$
1960	113440000
1961	124980000
1962	103840000
1963	149680000
1964	118130000
1965	149220000
1966	27830000
1967	29220000
1968	144570000
1969	135960000
1970	184540000
1971	178220000
1972	196300000
1973	135430000
1974	190590000
1975	177550000
1976	333710000
1977	253380000
1978	154600000
1979	197310000
1980	162060000
1981	225370000
1982	240400000
1983	10280000
1984	14610000
1985	26910000
1986	27260000
1987	37790000
1988	35570000
1989	88310000
1990	89520000
1991	61720000
1992	107890000
1993	110030000
1994	81220000
1995	90480000
1996	131530000
1997	102040000
1998	77060000
1999	48260000
2000	49220000
2001	37370000
2002	18840000
2003	15070000
2004	27080000
2005	45160000
2006	63800000
2007	131500000
2008	83880000
2009	132680000
2010	91480000
2011	75490000
2012	36100000
2013	26460000
2014	11410000
2015	16000000
2016	16530000
2017	19580000