Year	current US$
1960	131000000
1961	169000000
1962	156000000
1963	170000000
1964	235000000
1965	236000000
1966	254000000
1967	264000000
1968	307000000
1969	333000000
1970	388000000
1971	400000000
1972	454000000
1973	710000000
1974	969000000
1975	1127000000
1976	1296000000
1977	1756000000
1978	2326000000
1979	2491000000
1980	2967000000
1981	2382000000
1982	2180000000
1983	1839000000
1984	1496000000
1985	1749000000
1986	2055000000
1987	2370000000
1988	2079000000
1989	2111000000
1990	2097000000
1991	2103000000
1992	2352000000
1993	2115000000
1994	1917000000
1995	2931000000
1996	2902000000
1997	2781000000
1998	2991000000
1999	2898000000
2000	2482000000
2001	2548000000
2002	2599000000
2003	3279000000
2004	4715000000
2005	5865000000
2006	5820000000
2007	6683000000
2008	7884000000
2009	6960000000
2010	7849000000
2011	6720000000
2012	9769000000
2013	12721000000
2014	11118000000
2015	10406000000
2016	8581000000
2017	9614000000
2018	10970000000
2019	10483000000
2020	10527000000
2021	13966000000
2022	17889000000
2023	18887000000