Year	current US$
1960	120000000
1961	110000000
1962	116000000
1963	126000000
1964	130000000
1965	120000000
1966	140000000
1967	149000000
1968	158000000
1969	166000000
1970	182000000
1971	217000000
1972	315000000
1973	422000000
1974	921000000
1975	856000000
1976	788000000
1977	929000000
1978	1126000000
1979	1791000000
1980	2198000000
1981	2500000000
1982	1986000000
1983	1850000000
1984	1794000000
1985	1738000000
1986	1759000000
1987	2139000000
1988	2395000000
1989	2930000000
1990	3526000000
1991	3699000000
1992	4019000000
1993	3802000000
1994	4657000000
1995	5475000000
1996	5516000000
1997	5559000000
1998	5738000000
1999	5872000000
2000	5850000000
2001	6631000000
2002	6874000000
2003	8027000000
2004	9685000000
2005	10494000000
2006	11694000000
2007	15165000000
2008	19320000000
2009	14445000000
2010	16427000000
2011	17847000000
2012	17007000000
2013	17061000000
2014	16756000000
2015	14073000000
2016	13572000000
2017	14204000000
2018	15535000000
2019	14933000000
2020	13799000000
2021	16689000000
2022	18561000000
2023	19985000000