Year	current US$
1962	1710
1963	1820
1964	1960
1965	2080
1966	2200
1967	2330
1968	2400
1969	2420
1970	2480
1971	2760
1972	3210
1973	3910
1974	4370
1975	4890
1976	5030
1977	5240
1978	5950
1979	7590
1980	9560
1981	10670
1982	10670
1983	9870
1984	9280
1985	9170
1986	10260
1987	12720
1988	16180
1989	17400
1990	18590
1991	19410
1992	21510
1993	21390
1994	21920
1995	21120
1996	22850
1997	25570
1998	26970
1999	28120
2000	29420
2001	29110
2002	29190
2003	32250
2004	37810
2005	42700
2006	44850
2007	47390
2008	48390
2009	44080
2010	41770
2011	41100
2012	41800
2013	42790
2014	44580
2015	44380
2016	42960
2017	41660
2018	42020
2019	43240
2020	38750
2021	45550
2022	48640
2023	47800