Year	current US$
1960	155000000
1961	138000000
1962	146000000
1963	179000000
1964	225000000
1965	207000000
1966	265000000
1967	252000000
1968	241000000
1969	246000000
1970	252000000
1971	268000000
1972	324000000
1973	368000000
1974	403000000
1975	372000000
1976	440000000
1977	507000000
1978	476000000
1979	497000000
1980	511000000
1981	580000000
1982	450000000
1983	364000000
1984	298000000
1985	247000000
1986	361000000
1987	289000000
1988	275000000
1989	365000000
1990	331000000
1991	342000000
1992	416000000
1993	450000000
1994	519000000
1995	682000000
1996	784000000
1997	753000000
1998	589000000
1999	543000000
2000	734000000
2001	851000000
2002	980000000
2003	1216000000
2004	1479000000
2005	1679000000
2006	1865000000
2007	2139000000
2008	3121000000
2009	2982000000
2010	4051000000
2011	4735000000
2012	5075000000
2013	4559000000
2014	4628000000
2015	4834000000
2016	4500000000
2017	4113000000
2018	4041000000
2019	5005000000
2020	6061000000
2021	6391000000
2022	6825000000
2023	7292000000