Year	current US$
1960	6000000
1961	8000000
1962	9000000
1963	10000000
1964	16000000
1965	19000000
1966	23000000
1967	31000000
1968	51000000
1969	53000000
1970	90000000
1971	267000000
1972	343000000
1973	530000000
1974	1444000000
1975	2508000000
1976	2992000000
1977	3261000000
1978	3058000000
1979	3786000000
1980	5009000000
1981	6189000000
1982	4534000000
1983	3970000000
1984	3393000000
1985	2728000000
1986	2702000000
1987	2722000000
1988	2153000000
1989	2487000000
1990	238000000
1991	225000000
1992	192000000
1993	162000000
1994	167000000
1995	176000000
1996	186000000
1997	181000000
1998	300000000
1999	426000000
2000	555000000
2001	376000000
2002	389000000
2003	365000000
2004	401000000
2005	429000000
2006	547000000
2007	670000000
2008	696000000
2009	585000000
2010	620000000
2011	727000000
2012	828000000
2013	811000000
2014	690000000
2015	443000000
2016	403000000
2017	473000000
2018	513000000
2019	537000000
2020	335000000
2021	543000000
2022	610000000
2023	708000000