Year	current US$
1960	88000000
1961	95000000
1962	104000000
1963	111000000
1964	123000000
1965	150000000
1966	162000000
1967	143000000
1968	173000000
1969	155000000
1970	172000000
1971	188000000
1972	189000000
1973	214000000
1974	283000000
1975	313000000
1976	352000000
1977	352000000
1978	455000000
1979	567000000
1980	716000000
1981	739000000
1982	786000000
1983	875000000
1984	942000000
1985	993000000
1986	1102000000
1987	1066000000
1988	1129000000
1989	943000000
1990	1081000000
1991	472000000
1992	839000000
1993	787000000
1994	1033000000
1995	1145000000
1996	1401000000
1997	1113000000
1998	1517000000
1999	1538000000
2000	1260000000
2001	1811000000
2002	1594000000
2003	2686000000
2004	2874000000
2005	4095000000
2006	5207000000
2007	5809000000
2008	8277000000
2009	7668000000
2010	8602000000
2011	8896000000
2012	11913000000
2013	12072000000
2014	15357000000
2015	16702000000
2016	16429000000
2017	15761000000
2018	15305000000
2019	14554000000
2020	13115000000
2021	15973000000
2022	18663000000
2023	17888000000