Year	current US$
1960	110000000
1961	107000000
1962	113000000
1963	124000000
1964	139000000
1965	178000000
1966	179000000
1967	191000000
1968	214000000
1969	245000000
1970	317000000
1971	350000000
1972	373000000
1973	455000000
1974	720000000
1975	694000000
1976	770000000
1977	1021000000
1978	1166000000
1979	1397000000
1980	1540000000
1981	1209000000
1982	889000000
1983	988000000
1984	1094000000
1985	1098000000
1986	1148000000
1987	1383000000
1988	1410000000
1989	1717000000
1990	1990000000
1991	1877000000
1992	2441000000
1993	3515000000
1994	3789000000
1995	4090000000
1996	4327000000
1997	4970000000
1998	6239000000
1999	6355000000
2000	6389000000
2001	6569000000
2002	7188000000
2003	7663000000
2004	8268000000
2005	9824000000
2006	11548000000
2007	12952000000
2008	15372000000
2009	11395000000
2010	13570000000
2011	16220000000
2012	17591000000
2013	18127000000
2014	17509000000
2015	16273000000
2016	15456000000
2017	16796000000
2018	18289000000
2019	17573000000
2020	14942000000
2021	20728000000
2022	22685000000
2023	24039000000