Year	constant 2015 US$
1960	818.2841123036081
1961	813.7319118630506
1962	810.8930223111763
1963	782.6825140488374
1964	792.6283115628488
1965	768.5097542142249
1966	763.762928529014
1967	784.4403565041247
1968	815.1554019606257
1969	821.9220244511679
1970	840.6043046522041
1971	848.0013807311725
1972	812.2000722701844
1973	767.2686587026355
1974	759.3312950916821
1975	746.0913248257687
1976	701.8915280584413
1977	697.4477953754057
1978	659.1158273788643
1979	703.1302166499787
1980	689.5314071442077
1981	604.4517822371888
1982	576.4585133408938
1983	565.5769753385088
1984	559.732836876336
1985	550.6598678869755
1986	546.0405539697207
1987	537.1317810261953
1988	539.7562419718665
1989	545.6848679675371
1990	546.3711989255281
1991	496.76082155716614
1992	487.57280289221944
1993	482.6417827678936
1994	467.50089637617765
1995	460.5071840854518
1996	455.69716718554974
1997	457.7743232615473
1998	460.98213890130734
1999	467.9191931888432
2000	474.13902191409403
2001	487.66110252351666
2002	414.68733644266644
2003	442.10322966432255
2004	451.921226359558
2005	459.77498259123325
2006	470.6185887303003
2007	483.14527139851236
2008	500.78247263489027
2009	467.115644011521
2010	456.7292070788449
2011	451.12750464152714
2012	452.20500843305774
2013	450.41208525845485
2014	453.3834142416365
2015	455.6380345840702
2016	461.736048112361
2017	467.65506762466345
2018	470.42389826686514
2019	478.9269613529736
2020	433.8382399914943
2021	447.7846759188704
2022	453.8581470116518
2023	460.8341287979616