Year	constant 2015 US$
1960	6385.076182342037
1961	6842.725859142888
1962	7426.786210110593
1963	7018.36081405267
1964	7339.779616568117
1965	8149.479251403302
1966	8447.302314154671
1967	9316.704726397253
1968	9933.894497354127
1969	10650.1779044218
1970	11624.14979434531
1971	12031.47202198636
1972	12129.275158591732
1973	12232.35302231022
1974	11606.136835250822
1975	11328.528554209242
1976	11762.068898989199
1977	12126.796342794718
1978	12650.013236897086
1979	13576.811959021938
1980	14101.183927859613
1981	13773.060541801335
1982	13048.96731333748
1983	13070.252919959048
1984	13500.094582865338
1985	13614.913271453779
1986	14284.419388154185
1987	14638.433433434235
1988	15145.242646243025
1989	15690.653293689165
1990	15165.282050987471
1991	14543.848731296306
1992	13673.241514541058
1993	13740.333786396954
1994	13978.221330657409
1995	14227.613525229992
1996	14765.787825225747
1997	15440.377915582103
1998	15990.673779289462
1999	16012.119711999432
2000	16693.434527123758
2001	16254.337342378085
2002	16316.046096518001
2003	16605.934662987296
2004	16777.248575842066
2005	17377.956557378133
2006	18368.27511824484
2007	18679.79719307751
2008	18716.00723245207
2009	17701.9155868721
2010	17251.369833056735
2011	17069.96404755429
2012	16983.608113517163
2013	16720.082456410153
2014	16672.51917174702
2015	17040.417609131087
2016	17439.908046351815
2017	17495.900406198965
2018	17334.213137748524
2019	17369.509969937775
2020	15163.66720588501
2021	14957.234719246699
2022	16947.382214479792
2023	17690.196482172007