Year	current US$
1960	385000000
1961	380000000
1962	380000000
1963	364000000
1964	394000000
1965	409000000
1966	357000000
1967	348000000
1968	342000000
1969	322000000
1970	342000000
1971	344000000
1972	338000000
1973	410000000
1974	527000000
1975	569000000
1976	572000000
1977	761000000
1978	845000000
1979	981000000
1980	1062000000
1981	1088000000
1982	1031000000
1983	1063000000
1984	1467000000
1985	1333000000
1986	1215000000
1987	1393000000
1988	1476000000
1989	1545000000
1990	1912000000
1991	1987000000
1992	2455000000
1993	2859000000
1994	3208000000
1995	3798000000
1996	4095000000
1997	4639000000
1998	4809000000
1999	4594000000
2000	5430000000
2001	4816000000
2002	4699000000
2003	5125000000
2004	5757000000
2005	6347000000
2006	6886000000
2007	7740000000
2008	8452000000
2009	7345000000
2010	8602000000
2011	10236000000
2012	9380000000
2013	10208000000
2014	11298000000
2015	10547000000
2016	10310000000
2017	11360000000
2018	11890000000
2019	11940000000
2020	10047000000
2021	12499000000
2022	13107000000
2023	11911000000