Year	constant 2015 US$
1965	21974.01521074821
1966	23229.23586006258
1967	21352.999334019663
1968	23683.823259437573
1969	22243.472133077492
1970	21821.445273615194
1971	23596.490066453247
1972	21715.20719843938
1973	22617.921369989446
1974	25808.73671805254
1975	23756.381953503173
1976	24899.860305775856
1977	24624.16173497955
1978	26226.202672187614
1979	26427.644435200033
1980	25739.595166497227
1981	25591.407216096068
1982	25212.369367892505
1983	25144.706193777118
1984	25161.444271765133
1985	24279.31527571894
1986	26906.220315022692
1987	26602.86832900908
1988	25024.66664352486
1989	24966.797636924155
1990	24464.159536656767
1991	24845.85590790104
1992	24018.095626986884
1993	23272.69193372569
1994	22486.059503842796
1995	22034.32785841214
1996	21538.69145692199
1997	21166.024901385917
1998	21191.940940432993
1999	21247.9869529184
2000	21578.599854580814
2001	21157.334901846003
2002	20999.77383246608
2003	21117.523442338275
2004	21006.61966814162
2005	20766.378705095703
2006	20658.377816376797
2007	20763.088509008983
2008	20588.346501545937
2009	19596.68344024134
2010	19012.05333387817
2011	18353.40248002032
2012	18099.479902374864
2013	18080.30796176072
2014	18072.113791890457
2015	18252.514203209405
2016	18573.384925396822
2017	19260.619532475466
2018	19471.39010618082
2019	19856.259059083797
2020	18321.527964577148
2021	18575.386202645004
2022	19262.613199834108