Year	current US$
1960	114000000
1961	107000000
1962	97000000
1963	128000000
1964	151000000
1965	165000000
1966	174000000
1967	214000000
1968	255000000
1969	242000000
1970	274000000
1971	340000000
1972	319000000
1973	397000000
1974	678000000
1975	987000000
1976	958000000
1977	1189000000
1978	1505000000
1979	1600000000
1980	2253000000
1981	2246000000
1982	2169000000
1983	1487000000
1984	1616000000
1985	1767000000
1986	1810000000
1987	2252000000
1988	1714000000
1989	1855000000
1990	1862000000
1991	2397000000
1992	2501000000
1993	2562000000
1994	3690000000
1995	4193000000
1996	3935000000
1997	4955000000
1998	5576000000
1999	3017000000
2000	3721000000
2001	5363000000
2002	6431000000
2003	6703000000
2004	8226000000
2005	10287000000
2006	12114000000
2007	13893000000
2008	18852000000
2009	15090000000
2010	20591000000
2011	24438000000
2012	25477000000
2013	27146000000
2014	27726000000
2015	21518000000
2016	16324000000
2017	20010000000
2018	23177000000
2019	22564000000
2020	17918000000
2021	25690000000
2022	33049000000
2023	30898000000