Year	constant 2015 US$
1975	6173.28955078125
1976	7484.796875
1977	8708.41015625
1978	9350.9462890625
1979	10197.6142578125
1980	10667.7890625
1981	10756.20703125
1982	11269.7626953125
1983	11801.1376953125
1984	12669.4365234375
1985	13127.466796875
1986	13458.462890625
1987	14253.4912109375
1988	15322.615234375
1989	16306.251953125
1990	17144.388671875
1991	16829.833984375
1992	17928.45703125
1993	17623.201171875
1994	18280.935546875
1995	19453.755859375
1996	19385.203125
1997	19617.09375
1998	20562.1953125
1999	21349.64453125
2000	22383.857421875
2001	23019.138671875
2002	23604.0703125
2003	23930.66015625
2004	24799.537109375
2005	25631.255859375
2006	26395.400390625
2007	27156.671875
2008	27449.03125
2009	26183.451171875
2010	26090.037109375
2011	25538.771484375
2012	24285.486328125
2013	22738.48046875
2014	22581.81640625
2015	23487.21875
2016	24916.619140625
2017	26101.28515625
2018	27241.064453125
2019	28362.083984375
2020	27076.740234375
2021	29484.400390625
2022	30556.71875
2023	30768.919921875