Year	current US$
1974	1426000000
1975	1312000000
1976	982000000
1977	982000000
1978	983000000
1979	1694000000
1980	2071000000
1981	2490000000
1982	2140000000
1983	1513000000
1984	1807000000
1985	1714000000
1986	1634000000
1987	2021000000
1988	1776000000
1989	3063000000
1990	3246000000
1991	2819000000
1992	3008000000
1993	2919000000
1994	2627000000
1995	3327000000
1996	3542000000
1997	4197000000
1998	5356000000
1999	4533000000
2000	4560000000
2001	2786000000
2002	1936000000
2003	729000000
2004	804000000
2005	1368000000
2006	1833000000
2007	2096000000
2008	2439000000
2009	1834000000
2010	1819000000
2011	1883000000
2012	1881000000
2013	1901000000
2014	1739000000
2015	1385000000
2016	1186000000
2017	1048000000
2018	1128000000
2019	848000000
2020	810000000
2021	724000000
2022	694000000
2023	868000000