Year	current US$
1960	180000000
1961	186000000
1962	201000000
1963	186000000
1964	180000000
1965	168000000
1966	176000000
1967	206000000
1968	193000000
1969	209000000
1970	247000000
1971	312000000
1972	376000000
1973	512000000
1974	1127000000
1975	1189000000
1976	1668000000
1977	2029000000
1978	2045000000
1979	2480000000
1980	3483000000
1981	4124000000
1982	3614000000
1983	3262000000
1984	3480000000
1985	3107000000
1986	2405000000
1987	2714000000
1988	2593000000
1989	3134000000
1990	3712000000
1991	4115000000
1992	4263000000
1993	3857000000
1994	3761000000
1995	3715000000
1996	4272000000
1997	4026000000
1998	3566000000
1999	3698000000
2000	4633000000
2001	4306000000
2002	5013000000
2003	5657000000
2004	7385000000
2005	9393000000
2006	10515000000
2007	11488000000
2008	14980000000
2009	10100000000
2010	12260000000
2011	12730000000
2012	10891000000
2013	9997000000
2014	12216000000
2015	12408000000
2016	11579000000
2017	13145000000
2018	14871000000
2019	13256000000
2020	12683000000
2021	14188000000
2022	15537000000
2023	15367000000