Year	current US$
1960	17000000
1961	20000000
1962	22000000
1963	26000000
1964	27000000
1965	37000000
1966	34000000
1967	49000000
1968	48000000
1969	50000000
1970	60000000
1971	67000000
1972	69000000
1973	96000000
1974	138000000
1975	178000000
1976	200000000
1977	182000000
1978	311000000
1979	435000000
1980	623000000
1981	594000000
1982	526000000
1983	551000000
1984	447000000
1985	324000000
1986	352000000
1987	435000000
1988	516000000
1989	583000000
1990	663000000
1991	718000000
1992	866000000
1993	873000000
1994	927000000
1995	1008000000
1996	1062000000
1997	1066000000
1998	1083000000
1999	1068000000
2000	1046000000
2001	1129000000
2002	955000000
2003	1519000000
2004	1925000000
2005	1890000000
2006	1910000000
2007	1840000000
2008	1580000000
2009	1780000000
2010	1960000000
2011	1950000000
2012	1848000000
2013	1693000000
2014	1690000000
2015	1412000000
2016	1476000000
2017	1612000000
2018	1858000000
2019	1832000000
2020	1605000000
2021	2123000000
2022	1973000000
2023	1925000000