Year	current US$
1974	311000000
1975	372000000
1976	436000000
1977	623000000
1978	242000000
1979	293000000
1980	466000000
1981	387000000
1982	950000000
1983	1073000000
1984	1169000000
1985	1224000000
1986	1288000000
1987	1555000000
1988	1701000000
1989	2208000000
1990	2794000000
1991	2931000000
1992	3277000000
1993	3591000000
1994	3418000000
1995	4654000000
1996	6034000000
1997	8085000000
1998	9439000000
1999	8449000000
2000	7624000000
2001	5633000000
2002	5513000000
2003	6824000000
2004	9378000000
2005	10756000000
2006	11016000000
2007	14932000000
2008	17095000000
2009	15974000000
2010	18507000000
2011	19571000000
2012	19425000000
2013	25153000000
2014	26775000000
2015	24853000000
2016	24694000000
2017	26376000000
2018	27972000000
2019	27696000000
2020	23003000000
2021	28999000000
2022	39013000000
2023	47825000000