Year	current US$
1962	2410
1963	2600
1964	2860
1965	3090
1966	3330
1967	3610
1968	3940
1969	4280
1970	4690
1971	4990
1972	5670
1973	7050
1974	8580
1975	10160
1976	10720
1977	11290
1978	12460
1979	14790
1980	17300
1981	17530
1982	15760
1983	13550
1984	13020
1985	13080
1986	15330
1987	19360
1988	24190
1989	26090
1990	27760
1991	29110
1992	31340
1993	28200
1994	27690
1995	28070
1996	30400
1997	31390
1998	31110
1999	31300
2000	31610
2001	29720
2002	29090
2003	32750
2004	39790
2005	45770
2006	49150
2007	52310
2008	55720
2009	52640
2010	54630
2011	56700
2012	59090
2013	61800
2014	61870
2015	58440
2016	54390
2017	53050
2018	55700
2019	56470
2020	54810
2021	60860
2022	63900
2023	61650