Year	current US$
1976	1024.72302246094
1977	1332.72424316406
1978	1734.13745117188
1979	2287.0849609375
1980	3762.48657226563
1981	3545.2119140625
1982	3620.51586914063
1983	3547.87377929688
1984	3690.63061523438
1985	3878.41479492188
1986	4807.759765625
1987	5708.23291015625
1988	6525.63232421875
1989	6882.02099609375
1990	8259.68359375
1991	8310.265625
1992	9681.50390625
1993	9017.1201171875
1994	9940.1640625
1995	12442.8740234375
1996	12306.1826171875
1997	11472.2919921875
1998	13496.974609375
1999	12438.0390625
2000	11346.9306640625
2001	11974.1357421875
2002	13312.5478515625
2003	17016.919921875
2004	19631.4921875
2005	20741.3828125
2006	22178.787109375
2007	25734.27734375
2008	30762.45703125
2009	28200.1171875
2010	26890.353515625
2011	29378.478515625
2012	25145.888671875
2013	23695.255859375
2014	22731.18359375
2015	20165.8515625
2016	20629.857421875
2017	22676.0390625
2018	24887.5703125
2019	24414.591796875
2020	22488.416015625
2021	24687.482421875