Year	current US$
1960	49000000
1961	49000000
1962	41000000
1963	48000000
1964	60000000
1988	258000000
1989	305000000
1990	230000000
1991	100000000
1992	70000000
1993	122000000
1994	140000000
1995	202000000
1996	207000000
1997	139000000
1998	205000000
1999	351000000
2000	261000000
2001	307000000
2002	340000000
2003	448000000
2004	605000000
2005	659000000
2006	790000000
2007	1079000000
2008	1027000000
2009	1091000000
2010	1544000000
2011	1947000000
2012	1967000000
2013	2339000000
2014	2429000000
2015	1917000000
2016	1959000000
2017	2292000000
2018	2870000000
2019	2716000000
2020	2506000000
2021	3559000000
2022	4309000000
2023	4324000000