Year current US$ 1960 162.34251747038803 1961 166.26368200691107 1962 171.96191564168768 1963 182.01847949327123 1964 192.63998934149234 1965 202.84782399007352 1966 214.66691374343196 1967 226.9788587275291 1968 237.91143081607007 1969 256.3563813226537 1970 253.38236953436842 1971 268.350078588673 1972 282.73695773109057 1973 354.4988316492266 1974 421.97718473824415 1975 435.97790164808737 1976 430.2612437293216 1977 468.3010068557675 1978 509.47988170633846 1979 578.563220048066 1980 728.0890323640318 1981 747.0454573277483 1982 689.9426708349292 1983 711.6782407162448 1984 638.7480972664769 1985 534.63657158749 1986 560.7698116275845 1987 653.1414144793772 1988 690.2183540187742 1989 712.2410392130139 1990 810.6467000798065 1991 858.7276186333222 1992 732.3604178348145 1993 715.8921171725973 1994 707.1772015844689 1995 773.575368635221 1996 750.7713557236956 1997 774.5496348065294 1998 704.2773157197875 1999 678.0041559673613 2000 715.1425073328768 2001 633.4733816479533 2002 633.5202006970133 2003 819.9867050418869 2004 994.1938544284176 2005 1130.1689380013534 2006 1235.8471246754218 2007 1379.7467564910712 2008 1439.240924290848 2009 1404.5359480315626 2010 1622.6840929933621 2011 1757.9984040635206 2012 1724.2040526109065 2013 1696.356039613212 2014 1678.553609768775 2015 1498.805083588019 2016 1346.3012812077948 2017 1485.7535786146984 2018 1558.6120792590652 2019 1508.4868864894822 2020 1356.0888714153127 2021 1545.9566966038087 2022 1642.4320389949287 2023 1672.5059574691957