Year current US$ 1962 1780.4586132175393 1963 1929.9146973085299 1964 2123.678168936729 1965 2354.4830518233034 1966 2563.84027086831 1967 2725.4136977804574 1968 2865.0108058688334 1969 3121.716045547906 1970 1861.6622364367395 1971 2056.978200351141 1972 2404.8776906930825 1973 3080.0079202013944 1974 3809.4797748960405 1975 4402.421376835875 1976 4669.736237318053 1977 5008.233478113189 1978 5679.282968830246 1979 7019.113507039106 1980 8391.748602776359 1981 8307.200922325772 1982 7522.322999463075 1983 6695.196386210792 1984 6501.664190781665 1985 6507.052729385395 1986 7511.238845379464 1987 9579.936137254406 1988 12397.604244541088 1989 13284.737014897308 1990 14306.637265794216 1991 15287.991998456135 1992 17154.52479939861 1993 16905.910437540395 1994 17389.387125981306 1995 18389.30962711445 1996 19525.086983828707 1997 19596.686198209543 1998 18822.72226142585 1999 18536.777184374507 2000 18451.066242117162 2001 17772.051789442547 2002 17461.201814165368 2003 19734.01486636777 2004 24022.48332253338 2005 27631.27716687042 2006 29599.57984717794 2007 31664.18917910286 2008 34406.78496269178 2009 34552.008374232224 2010 34775.16482545472 2011 35236.32585987769 2012 34499.216498568414 2013 34798.10664108939 2014 34801.17819917037 2015 33399.82024200587 2016 32173.538468486888 2017 31829.427733632027 2018 34567.04378703777 2019 35981.8307210681 2020 34314.65665486085 2021 38097.311038730906 2022 40157.77676996225 2023 40328.537233120696