Year	current US$
1960	313999999.99999994
1961	336999999.99999994
1962	324999999.99999994
1963	335999999.99999994
1964	414999999.99999994
1965	464999999.99999994
1966	533999999.99999994
1967	581000000
1968	579000000
1969	753000000
1970	865000000
1971	1084000000
1972	1113000000
1973	1472000000
1974	2856000000
1975	3815000000
1976	4266000000.0000005
1977	4842000000
1978	4479000000
1979	5109000000
1980	9501000000
1981	9473000000
1982	8294000000
1983	6523000000
1984	5938000000
1985	4883000000
1986	5218000000
1987	5056000000
1988	4486000000
1989	5628000000
1990	3805000000
1991	3933000000
1992	3884000000
1993	3906999999.9999995
1994	3977999999.9999995
1995	4541999999.999999
1996	4794999999.999999
1997	5545999999.999999
1998	5600000000
1999	5658000000.000001
2000	6289000000
2001	6037000000
2002	5857000000
2003	6508000000.000001
2004	6965000000.000001
2005	8537000000.000001
2006	9446000000
2007	10139000000
2008	11281000000
2009	9558000000
2010	10246000000
2011	11724000000
2012	12546000000
2013	12415000000
2014	12622000000
2015	11527000000
2016	10616000000
2017	11334000000
2018	12810000000
2019	14409999999.999998
2020	10478999999.999998
2021	14482999999.999998
2022	16006000000
2023	19397000000