Year	current US$
1980	900000000
1981	1000000000
1982	1100000000
1983	1200000000
1984	1200000000
1985	1325000000
1986	1628000000
1987	1407000000
1988	1674000000
1989	1686000000
1990	1857000000
1991	1960000000
1992	1010000000
1993	1020000000
1994	1034000000
1995	959000000
1996	909000000
1997	1098000000
1998	651000000
1999	637000000
2000	708000000
2001	826000000
2002	1008000000
2003	1066000000
2004	1278000000
2005	1338000000
2006	1465000000
2007	1685000000
2008	2060000000
2009	1995000000
2010	2555000000
2011	3705000000
2012	3955000000
2013	3835000000
2014	4365000000
2015	4152000000
2016	3006000000
2017	1770000000
2018	251000000
2019	280000000
2020	90000000
2021	80000000
2022	160000000
2023	347000000