Year	current US$
1960	400000000
1961	424000000
1962	407000000
1963	407000000
1964	469000000
1965	550000000
1966	634000000
1967	680000000
1968	292000000
1969	332000000
1970	449000000
1971	492000000
1972	1169000000
1973	1060000000
1974	1193000000
1975	1053000000
1976	1186000000
1977	1213000000
1978	1634000000
1979	2462000000
1980	2618000000
1981	2883000000
1982	2397000000
1983	3077000000
1984	2558000000
1985	2740000000
1986	3384000000
1987	4172000000
1988	4522000000
1989	4709000000
1990	5589000000
1991	6528000000
1992	7317000000
1993	6688000000
1994	7365000000
1995	7992000000
1996	9321000000
1997	8717000000
1998	8494000000
1999	8424000000
2000	9028000000
2001	9238000000
2002	9913000000
2003	11930000000
2004	13379000000
2005	16051000000
2006	16930000000
2007	17838000000
2008	20323000000
2009	17523000000
2010	21410000000
2011	25383000000
2012	24567000000
2013	25121000000
2014	24731000000
2015	22089000000
2016	20375000000
2017	21569000000
2018	23425000000
2019	23329000000
2020	21979000000
2021	28319000000
2022	30901000000
2023	28488000000