Year	current US$
1986	210000000
1987	250000000
1988	355000000
1989	402000000
1990	581000000
1991	1403000000
1992	1306000000
1993	1396000000
1994	1439000000
1995	1597000000
1996	2035000000
1997	2116000000
1998	1518000000
1999	1994000000
2000	2582000000
2001	2372000000
2002	2017000000
2003	2397000000
2004	3589000000
2005	4288000000
2006	4723000000
2007	5126000000
2008	6011000000
2009	2449000000
2010	1394000000
2011	5917000000
2012	2046000000
2013	1377000000
2014	1350000000
2015	1250000000
2016	1138000000
2017	1124000000
2018	1232000000
2019	1206000000
2020	863000000
2021	1064000000
2022	1375000000
2023	1365000000