Year current US$ 1960 139.98612554946328 1961 140.09830925925297 1962 143.88799277619782 1963 143.69038986083083 1964 150.44857758052092 1965 142.63557596510063 1966 146.17464677338074 1967 133.14591673331412 1968 123.48288477370762 1969 150.0434479698773 1970 156.4063769839688 1971 148.1065857211583 1972 161.17496799397014 1973 195.58334271797645 1974 216.3969073663386 1975 222.3072995554585 1976 191.08137837750692 1977 218.1705668005379 1978 296.9751336034715 1979 336.1613570936205 1980 326.7954585810655 1981 324.3792923919125 1982 369.02914384330376 1983 277.563168273301 1984 296.6100620204413 1985 228.53954135983054 1986 127.55452606038841 1987 167.205900256729 1988 260.1153896865368 1989 224.31782835083447 1990 150.1932537765697 1991 178.17909843476474 1992 158.0814981328001 1993 178.97299706793535 1994 211.338563985166 1995 201.37112282827897 1996 216.62341891992048 1997 193.01081255828728 1998 151.09656286768973 1999 149.57834190235857 2000 138.71394161532712 2001 221.29508561880047 2002 240.50751930630466 2003 255.97261857887534 2004 258.4731688039633 2005 286.2859062898799 2006 320.51441080857865 2007 358.0773155386085 2008 402.5534054635252 2009 386.43386849055713 2010 400.5407437083373 2011 443.4518421712733 2012 558.1797233151252 2013 706.4526815073978 2014 702.3385877301458 2015 581.2934118149541 2016 515.447839602837 2017 484.45612876759145 2018 519.6499638616218 2019 506.60691377907835 2020 493.4322405514235 2021 504.62128762153145 2022 475.79572784462187 2023 433.3741743300597