Year	current US$
1962	1080
1963	1160
1964	1270
1965	1370
1966	1500
1967	1590
1968	1720
1969	1890
1970	2090
1971	2330
1972	2760
1973	3580
1974	4650
1975	5540
1976	5980
1977	6660
1978	7540
1979	9620
1980	11460
1981	11180
1982	10380
1983	9600
1984	9270
1985	9360
1986	10820
1987	13810
1988	18070
1989	19300
1990	20630
1991	21810
1992	24520
1993	24870
1994	26140
1995	28190
1996	30090
1997	29560
1998	27970
1999	27080
2000	26810
2001	25320
2002	25030
2003	28100
2004	33850
2005	38770
2006	41500
2007	44540
2008	49210
2009	49150
2010	49750
2011	50700
2012	50100
2013	50720
2014	50390
2015	47480
2016	46240
2017	45040
2018	48980
2019	51000
2020	48980
2021	53150
2022	55720
2023	55070