Year	current US$
1972	260000000
1973	358000000
1974	348000000
1975	327000000
1976	401000000
1977	476000000
1978	548000000
1979	659000000
1980	759000000
1981	791000000
1982	769000000
1983	724000000
1984	931000000
1985	999000000
1986	880000000
1987	1067000000
1988	1291000000
1989	1305000000
1990	1671000000
1991	1689000000
1992	2098000000
1993	2545000000
1994	2934000000
1995	3501000000
1996	4249000000
1997	4832000000
1998	5121000000
1999	5497000000
2000	6389000000
2001	6080000000
2002	6149000000
2003	6990000000
2004	8305000000
2005	9297000000
2006	11802000000
2007	12453000000
2008	15370000000
2009	15083000000
2010	19194000000
2011	24439000000
2012	25127000000
2013	29114000000
2014	30405000000
2015	32379000000
2016	34894000000
2017	35851000000
2018	39252000000
2019	39337000000
2020	33605000000
2021	44223000000
2022	54695000000
2023	55788000000