Year	constant 2015 US$
1961	230000
1962	650000
1963	1200000
1964	1450000
1965	1550000
1966	2890000
1967	4930000
1968	6340000
1969	3370000
1970	9140000
1971	11060000
1972	17070000
1973	16370000
1974	24200000
1975	53280000
1976	41830000
1977	69930000
1978	58830000
1979	75590000
1980	58210000
1981	59090000
1982	55600000
1983	67010000
1984	53490000
1985	51930000
1986	46070000
1987	62450000
1988	48230000
1989	50060000
1990	71410000
1991	80880000
1992	74000000
1993	71520000
1994	58810000
1995	52060000
1996	39860000
1997	37340000
1998	52090000
1999	34930000
2000	43560000
2001	66400000
2002	55920000
2003	43660000
2004	38750000
2005	48880000
2006	53650000
2007	39200000
2008	39970000
2009	74140000
2010	134540000
2011	79760000
2012	95480000
2013	97350000
2014	82800000
2015	95300000
2016	88640000
2017	126750000