Year current US$ 1960 81.58694729620093 1961 87.5173724745356 1962 89.49333553765243 1963 93.88388624952903 1964 102.96120722913639 1965 114.37201864331364 1966 123.33047085489407 1967 136.63809251090893 1968 143.28794628096205 1969 150.54780405525665 1970 169.1240002307776 1971 175.19891999917607 1972 150.61721129504005 1973 99.29793152837584 1974 134.53218012749215 1975 164.8480958423849 1976 187.49690657035515 1977 208.77612019941733 1978 238.1558325434277 1979 254.34776061334853 1980 293.3918897736 1981 333.45839209696044 1982 349.841762254772 1983 315.01726589104766 1984 331.38876582064194 1985 320.6798100212317 1986 317.02979833839 1987 319.9153919152374 1988 356.33521538438805 1989 359.7292685905805 1990 346.6685155209078 1991 382.7514315465223 1992 399.465580740566 1993 412.6753983224586 1994 404.6068673664671 1995 455.50797315441736 1996 461.4002094979222 1997 441.7549177065007 1998 427.50632749509947 1999 420.68261061328565 2000 644.4571569817425 2001 610.1432316007363 2002 599.7894107587755 2003 673.3829660370936 2004 774.7853357349909 2005 832.7511375172342 2006 909.032403273312 2007 1012.1827941900157 2008 1087.5147770261094 2009 985.3493007627741 2010 1011.5971801772679 2011 1161.0443208475072 2012 1236.892762988228 2013 1259.6683682862288 2014 1303.1853698528214 2015 1421.8352783008904 2016 1468.8220823883319 2017 1567.640612335296 2018 1620.7425914833123 2019 1437.1658330724001 2020 1322.3147853955404 2021 1506.1082930591704 2022 1589.263980497136 2023 1407.0213505949523