Year	current US$
1976	411736938.5
1977	872086608.9
1978	1309296997
1979	1501616821
1980	2047622437
1981	2067108154
1982	2588121582
1983	2940239990
1984	2580805664
1985	2537092529
1986	2446387207
1987	2180528076
1988	1871958252
1989	2017306152
1990	2006266968
1991	1548698364
1992	1573619019
1993	1446277100
1994	1749277100
1995	1712219435.60135
1996	1284050241.16386
1997	1707282924.73027
1998	1172000000
1999	996000000
2000	1075000000
2001	1461000000
2002	3554000000
2003	3964000000
2004	3945000000
2005	4280000000
2006	5121000000
2007	5998000000
2008	7039000000
2009	8717000000
2010	9690000000
2011	12263000000
2012	14007000000
2013	14629000000
2014	17244000000
2015	19306000000
2016	19819000000
2017	19856000000
2018	21193000000
2019	22252000000
2020	26089000000
2021	31312000000
2022	30176000000
2023	26558000000