Year current US$ 1962 150.97799155299728 1963 164.84310198241235 1964 183.88791026827607 1965 202.48950465000084 1966 221.79681455734126 1967 232.75204917972164 1968 252.59550302779823 1969 287.4668720959801 1970 312.8043520694476 1971 340.2672170012729 1972 397.8182423243757 1973 505.91927947296927 1974 613.930989057809 1975 715.2232231366455 1976 740.7047426352927 1977 799.9309064679601 1978 944.1682179512981 1979 1146.1000823801096 1980 1301.265282824454 1981 1354.5363363720903 1982 1304.6568440799842 1983 1266.5993946300493 1984 1308.1572858137283 1985 1401.1025238762822 1986 1607.066749040015 1987 1956.6855371914498 1988 2500.441506872603 1989 2692.5722629617785 1990 2801.5227098247487 1991 2904.9599432560203 1992 3106.579368550321 1993 3371.2405093400384 1994 3691.112976728342 1995 4155.683247950394 1996 4367.130195372771 1997 4232.679317970015 1998 3702.4099392637163 1999 3661.4960659635076 2000 3870.4079230973753 2001 3956.681964707833 2002 3908.9824521271476 2003 4091.5215524553632 2004 4601.5398478475145 2005 5038.96495241727 2006 5323.449835528183 2007 5688.35897471248 2008 6194.696286296899 2009 6540.742751773969 2010 7357.459189835183 2011 8164.629757402577 2012 9126.540043231387 2013 9717.466094642949 2014 9938.615682290556 2015 9819.381919596372 2016 9894.506471130078 2017 10230.358977553155 2018 11097.984196634252 2019 11691.421717741592 2020 11644.777863058756 2021 12841.500642323195 2022 13525.913842585604 2023 13712.464400236573