Year	current US$
1960	38000000
1961	41000000
1962	40000000
1963	39000000
1964	40000000
1965	55000000
1966	59000000
1967	71000000
1968	73000000
1969	82000000
1970	76000000
1971	83000000
1972	83000000
1973	122000000
1974	198000000
1975	206000000
1976	220000000
1977	308000000
1978	383000000
1979	521000000
1980	615000000
1981	600000000
1982	672000000
1983	546000000
1984	586000000
1985	502000000
1986	578000000
1987	595000000
1988	574000000
1989	760000000
1990	1352000000
1991	1460000000
1992	1422000000
1993	1689000000
1994	2422000000
1995	3144000000
1996	3204000000
1997	3403000000
1998	2897000000
1999	1906000000
2000	2260000000
2001	2182000000
2002	1672000000
2003	2228000000
2004	3097000000
2005	3715000000
2006	4744000000
2007	5859000000
2008	9033000000
2009	6940000000
2010	10033000000
2011	12366000000
2012	11555000000
2013	12142000000
2014	12169000000
2015	10291000000
2016	9753000000
2017	11875000000
2018	13334000000
2019	12544000000
2020	10217000000
2021	13560000000
2022	15853000000
2023	16105000000