Year	current US$
1960	363000000
1961	400000000
1962	333000000
1963	365000000
1964	340000000
1965	448000000
1966	352000000
1967	307000000
1968	308000000
1969	347000000
1970	411000000
1971	430000000
1972	291000000
1973	452000000
1974	821000000
1975	791000000
1976	862000000
1977	1038000000
1978	1006000000
1979	852000000
1980	1129000000
1981	1106000000
1982	705000000
1983	1248000000
1984	608000000
1985	866000000
1986	1046000000
1987	1156000000
1988	905000000
1989	1273000000
1990	1205000000
1991	1055000000
1992	2169000000
1993	2575000000
1994	2108000000
1995	1906000000
1996	2108000000
1997	2326000000
1998	2563000000
1999	3480000000
2000	2973000000
2001	3154000000
2002	2720000000
2003	3210000000
2004	4074000000
2005	5347000000
2006	6754000000
2007	8061000000
2008	10269000000
2009	8046000000
2010	10922000000
2011	15838000000
2012	17763000000
2013	17600000000
2014	14600000000
2015	13465000000
2016	12920000000
2017	12647000000
2018	13134000000
2019	13411000000
2020	12429000000
2021	13629000000
2022	14621000000
2023	13715000000