Year	current US$
1960	2000000
1961	2000000
1962	2000000
1963	2000000
1964	3000000
1965	2000000
1966	2000000
1967	26000000
1968	105000000
1969	141000000
1970	143000000
1971	154000000
1972	167000000
1973	239000000
1974	823000000
1975	1044000000
1976	1134000000
1977	1139000000
1978	1096000000
1979	1570000000
1980	3748000000
1981	4696000000
1982	4421000000
1983	4248000000
1984	4422000000
1985	4972000000
1986	2842000000
1987	3776000000
1988	3268000000
1989	3933000000
1990	5508000000
1991	4871000000
1992	5428000000
1993	5299000000
1994	5545000000
1995	6068000000
1996	7346000000
1997	7630000000
1998	5508000000
1999	7238000000
2000	11319000000
2001	11074000000
2002	11172000000
2003	11669000000
2004	13342000000
2005	18692000000
2006	21585000000
2007	24692000000
2008	37719000000
2009	27651000000
2010	36601000000
2011	47092000000
2012	52138000000
2013	55497000000
2014	50718000000
2015	31927000000
2016	30014000000
2017	32904000000
2018	41761000000
2019	38724000000
2020	33479000000
2021	44591000000
2022	66063000000
2023	62736000000