Year	constant 2015 US$
1960	80000
1961	150000
1962	510000
1963	350000
1964	410000
1965	3600000
1966	4280000
1967	8790000
1968	11100000
1969	4500000
1970	9570000
1971	4550000
1972	6940000
1973	6830000
1974	12810000
1975	14310000
1976	18940000
1977	25480000
1978	28690000
1979	58290000
1980	38980000
1981	42060000
1982	42560000
1983	45320000
1984	40350000
1985	37140000
1986	32960000
1987	39940000
1988	31700000
1989	40120000
1990	44880000
1991	29820000
1992	36180000
1993	43890000
1994	47490000
1995	46210000
1996	39830000
1997	37590000
1998	37770000
1999	31760000
2000	28760000
2001	31370000
2002	36220000
2003	36730000
2004	24360000
2005	35950000
2006	25760000
2007	33390000
2008	26280000
2009	38440000
2010	63180000
2011	76330000
2012	64330000
2013	69250000
2014	71480000
2015	69680000
2016	82610000
2017	78750000