Year	current US$
1960	169000000
1961	149000000
1962	206000000
1963	239000000
1964	292000000
1965	320000000
1966	405000000
1967	477000000
1968	645000000
1969	676000000
1970	554000000
1971	703000000
1972	1043000000
1973	1806000000
1974	2762000000
1975	3542000000
1976	3212000000
1977	3773000000
1978	4603000000
1979	5311000000
1980	6777000000
1981	8382000000
1982	7175000000
1983	6029000000
1984	6222000000
1985	4101000000
1986	4445000000
1987	4684000000
1988	5869000000
1989	4923000000
1990	5336000000
1991	5361000000
1992	5165000000
1993	5551000000
1994	5548000000
1995	5392000000
1996	5873000000
1997	6123000000
1998	5466000000
1999	4158000000
2000	3732000000
2001	4397000000
2002	4396000000
2003	4330000000
2004	6326000000
2005	6079000000
2006	6041000000
2007	6733000000
2008	9150000000
2009	12859000000
2010	17674000000
2011	8000000000
2012	22000000000
2013	27000000000
2014	18994000000
2015	16429000000
2016	8667000000
2017	10556000000
2018	13786000000
2019	22694000000
2020	12912000000
2021	17432000000
2022	29634000000
2023	20523000000