Year	current US$
1960	2305000000
1961	2225000000
1962	2342000000
1963	2343000000
1964	2472000000
1965	2455000000
1966	2373000000
1967	3077000000
1968	2779000000
1969	3083000000
1970	3169000000
1971	3124000000
1972	3166000000
1973	4891000000
1974	11153000000
1975	8800000000
1976	9299000000
1977	9551000000
1978	9187000000
1979	14317000000
1980	19221000000
1981	20980000000
1982	16590000000
1983	13937000000
1984	15997000000
1985	14438000000
1986	8660000000
1987	10577000000
1988	10244000000
1989	13310000000
1990	17497000000
1991	15155000000
1992	14185000000
1993	14686000000
1994	16089000000
1995	18457000000
1996	23060000000
1997	23871000000
1998	17707000000
1999	20963000000
2000	33529000000
2001	26667000000
2002	26781000000
2003	27230000000
2004	39668000000
2005	55716000000
2006	65578000000
2007	69980000000
2008	95021000000
2009	57603000000
2010	65745000000
2011	92811000000
2012	97340000000
2013	88753000000
2014	74714000000
2015	37309000000
2016	26696000000
2017	31960000000
2018	34440000000
2019	17210000000
2020	5010000000
2021	3535000000
2022	4750000000
2023	8470000000