Year	constant 2015 US$
1976	7512.55029296875
1977	8808.4091796875
1978	9451.40234375
1979	10279.640625
1980	10769.2548828125
1981	10839.4638671875
1982	11349.4248046875
1983	11800.5703125
1984	12685.0546875
1985	13155.6552734375
1986	13303.591796875
1987	14105.9375
1988	15162.60546875
1989	16187.1171875
1990	17036.669921875
1991	16735.2578125
1992	17805.189453125
1993	17523.236328125
1994	18155.748046875
1995	18480.837890625
1996	18457.5859375
1997	18555.7578125
1998	21179.943359375
1999	20126.125
2000	20462.912109375
2001	21356.552734375
2002	22391.09765625
2003	22940.94921875
2004	23373.666015625
2005	24290.71875
2006	24932.5546875
2007	25408.658203125
2008	27000.720703125
2009	26111.767578125
2010	25718.6484375
2011	26206.740234375
2012	24118.123046875
2013	22442.75390625
2014	21968.767578125
2015	23328.69140625
2016	23910.603515625
2017	25294.703125
2018	26231.353515625
2019	26805.220703125
2020	25183.5
2021	26867.0625
2022	28237.91015625
2023	27584.017578125