Year	current US$
1962	1000
1963	1110
1964	1210
1965	1330
1966	1470
1967	1610
1968	1770
1969	1930
1970	2110
1971	2280
1972	2620
1973	3250
1974	3930
1975	4320
1976	4510
1977	4730
1978	5270
1979	6740
1980	8430
1981	8710
1982	8220
1983	7630
1984	7760
1985	8030
1986	9380
1987	12160
1988	15950
1989	17300
1990	18660
1991	20370
1992	22960
1993	21590
1994	20860
1995	20670
1996	21830
1997	22300
1998	22220
1999	21990
2000	21910
2001	21190
2002	20770
2003	23410
2004	28360
2005	32480
2006	34280
2007	35930
2008	37980
2009	37990
2010	37960
2011	37980
2012	36220
2013	35570
2014	34910
2015	33000
2016	31970
2017	31380
2018	33850
2019	34910
2020	32440
2021	36420
2022	38370
2023	38200