Year	current US$
1960	255000000
1961	316000000
1962	349000000
1963	424000000
1964	512000000
1965	548000000
1966	611000000
1967	552000000
1968	596000000
1969	585000000
1970	659000000
1971	731000000
1972	924000000
1973	1286000000
1974	2355000000
1975	2048000000
1976	612000000
1977	1539000000
1978	1922000000
1979	2700000000
1980	3650000000
1981	3499000000
1982	3391000000
1983	3661000000
1984	2948000000
1985	2203000000
1986	2203000000
1987	1880000000
1988	2457000000
1989	2235000000
1990	2525000000
1991	3743000000
1992	4202000000
1993	4821000000
1994	5933000000
1995	7278000000
1996	7540000000
1997	7467000000
1998	7070000000
1999	6207000000
2000	6230000000
2001	7380000000
2002	6560000000
2003	7315000000
2004	9609000000
2005	9633000000
2006	9647000000
2007	12251000000
2008	16754000000
2009	16574000000
2010	18460000000
2011	20750000000
2012	21945000000
2013	22024000000
2014	22081000000
2015	18965000000
2016	19368000000
2017	19911000000
2018	20396000000
2019	19641000000
2020	11355000000
2021	13857000000
2022	19503000000
2023	15286000000