Year	current US$
1960	477.786990828994
1961	624.7186325846211
1962	680.2995183444343
1963	592.2116793293216
1964	742.9520683696873
1965	706.2693549482459
1966	666.9876416425217
1967	584.6384724850466
1968	578.2248707414685
1969	722.5906832265127
1970	765.9117589883213
1971	1000.629502602798
1972	775.8361726554069
1973	1397.6872615315651
1974	1433.787561471232
1975	1231.921867384783
1976	1268.6258334848576
1977	1414.201588719531
1978	1678.3304335812873
1979	2442.0773299389293
1980	3440.528157864137
1981	3725.0032159483894
1982	3081.0473943602265
1983	1704.5659103170576
1984	1612.31925995459
1985	1564.707925613724
1986	1933.481231422897
1987	2408.6325986085785
1988	2668.674090522443
1989	2724.0974341128563
1990	2983.244161491772
1991	3574.1116214229974
1992	4083.463271684076
1993	4729.928639066889
1994	5478.022002226315
1995	6014.918522753682
1996	6358.162863141135
1997	7386.511422067339
1998	7780.6783489302625
1999	7314.490950529247
2000	6932.47813396337
2001	6331.156601875593
2002	4115.154549131948
2003	3638.9435907085854
2004	4130.1001146777
2005	5233.457170586684
2006	5942.126748990643
2007	7149.374633867964
2008	9328.065708199323
2009	9780.739617864094
2010	12512.594126844118
2011	14975.56281867366
2012	16087.25207779731
2013	18140.892213305906
2014	18131.578846566077
2015	16950.753169481555
2016	16837.94038030493
2017	18995.397019555403
2018	19067.291555573716
2019	18149.056290831475
2020	15651.003377537532
2021	17733.855164390214
2022	20499.24222444518
2023	22564.53246206867