Year	current US$
1962	1540
1963	1550
1964	1520
1965	1680
1966	1710
1967	1720
1968	2010
1969	2220
1970	2370
1971	2540
1972	2900
1973	3330
1974	4460
1975	5100
1976	4980
1977	4840
1978	5060
1979	5890
1980	6380
1981	7060
1982	6930
1983	6930
1984	6850
1985	6830
1986	7440
1987	8910
1988	10930
1989	11470
1990	12730
1991	13520
1992	15110
1993	15510
1994	16450
1995	17870
1996	19270
1997	19770
1998	19510
1999	19150
2000	19990
2001	19920
2002	19130
2003	19300
2004	20670
2005	22190
2006	23040
2007	24720
2008	26900
2009	28000
2010	30350
2011	32400
2012	33110
2013	35070
2014	36640
2015	36550
2016	36840
2017	38210
2018	41520
2019	43800
2020	43120
2021	49350
2022	55140
2023	55020