Year	current US$
1960	2.538634170961785
1961	2.3566837022972154
1962	3.5424603313695098
1963	2.1057176157985387
1964	2.218381859248618
1965	2.4398030348204838
1966	3.4581670226203904
1967	3.783673156340019
1968	4.3910311341875365
1969	4.671933542215169
1970	5.579556487137428
1971	6.258400255408137
1972	7.275885710945892
1973	9.113779907337179
1974	10.601023306520723
1975	20.012153612060086
1976	16.94416839358284
1977	19.85260218037283
1978	25.242012238591062
1979	29.010476309760964
1980	29.36809163057071
1981	28.169967076559836
1982	26.579277892763006
1983	25.381455907862005
1984	26.87589271028917
1985	28.185255277823824
1986	31.55373704397624
1987	35.47744475412054
1988	35.21870637471504
1989	31.592106731670125
1990	39.33353935822808
1991	47.9796031466087
1992	45.56882778628725
1993	44.77187151786257
1994	105.71593863648347
1995	122.15800852504117
1996	69.28885483881254
1997	29.964526701538414
1998	44.238245035982416
1999	46.586673526167836
2000	39.63753729568289
2001	37.045499677357725
2002	42.94993474174153
2003	39.211053354750796
2004	55.86308308935989
2005	63.44904173600454
2006	65.30590123613338
2007	65.00883181473529
2008	81.30447071581496
2009	81.64590822090175
2010	100.21213107423094
2011	119.4306591871348
2012	81.05285451983656
2013	97.85206655609453
2014	91.044068298916
2015	93.54323030057822
2016	96.42776882975289
2017	100.67831775183745
2018	89.3486359806885
2019	91.0227877412406
2020	123.60910263734027
2021	98.82120147553302
2022	78.16241208808236