Year	current US$
1968	29000000
1969	36600000
1970	38000000
1971	44500000
1972	58500000
1973	66500000
1974	88400000
1975	109200000
1976	121300000
1977	143600000
1978	150400000
1979	262200000
1980	304900000
1981	317300000
1982	367700000
1983	451100000
1984	497400000
1985	579400000
1986	686900000
1987	847000000
1988	1006400000
1989	1032100000
1990	1086200000
1991	1187200000
1992	1336600000
1993	2240800000
1994	2541300000
1995	2795100000
1996	3039300000
1997	3552400000
1998	3820000000
1999	4264200000
2000	4850600000
2001	4678700000
2002	4699200000
2003	5277000000
2004	5599870000
2005	6111400000
2006	6560000000
2007	6778500000
2008	6812700000
2009	6209900000
2010	5101000000
2011	5445900000
2012	5778100000
2013	6094100000
2014	6735100000
2015	7267400000
2016	7988500000
2017	8541700000
2018	9103600000
2019	9002200000
2020	4271800000
2021	7796900000
2022	11102800000
2023	12594400000