Year	current US$
1960	5000000
1961	4000000
1962	8000000
1963	14000000
1964	10000000
1965	10000000
1966	6000000
1967	4000000
1968	12000000
1969	12000000
1970	18000000
1971	20000000
1972	24000000
1973	36000000
1974	47000000
1975	53000000
1976	51000000
1977	55000000
1978	73000000
1979	40000000
1980	95000000
1981	234000000
1982	198000000
1983	227000000
1984	284000000
1985	296000000
1986	313000000
1987	346000000
1988	339000000
1989	378000000
1990	360000000
1991	372000000
1992	418000000
1993	467000000
1994	498000000
1995	416000000
1996	471000000
1997	529000000
1998	498000000
1999	453000000
2000	506000000
2001	507000000
2002	486000000
2003	611000000
2004	589000000
2005	506000000
2006	566000000
2007	460000000
2008	568000000
2009	482000000
2010	361000000
2011	345000000
2012	396000000
2013	479000000
2014	611000000
2015	675000000
2016	655000000
2017	595000000
2018	653000000
2019	712000000
2020	766000000
2021	884000000
2022	642000000
2023	635000000