Year	current US$
1960	5000000
1961	5000000
1962	6000000
1963	6000000
1964	9000000
1965	9000000
1966	10000000
1967	12000000
1968	12000000
1969	11000000
1970	12000000
1971	13000000
1972	15000000
1973	21000000
1974	31000000
1975	12000000
1976	17000000
1977	32000000
1978	37000000
1979	42000000
1980	36000000
1981	32000000
1982	23000000
1983	29000000
1984	44000000
1985	31000000
1986	17000000
1987	18000000
1988	20000000
1989	22000000
1990	19000000
1991	18000000
1992	24000000
1993	23000000
1994	25000000
1995	28000000
1996	30000000
1997	35000000
1998	34000000
1999	26000000
2000	26000000
2001	20000000
2002	20000000
2003	27000000
2004	37000000
2005	38000000
2006	49000000
2007	50000000
2008	57000000
2009	57000000
2010	49000000
2011	67000000
2012	55000000
2013	39000000
2014	63000000
2015	39000000
2016	50000000
2017	47000000
2018	61000000
2019	56000000
2020	46000000
2021	54000000
2022	61000000
2023	63000000