Year current US$ 1966 59999.9986588955 1967 109999.999403954 1968 79999.9982118607 1969 90000.0035762787 1970 119999.997317791 1971 140000.000596046 1972 180000.00715255702 1973 409999.99642372096 1974 490000.009536743 1975 610000.014305115 1976 589999.973773956 1977 819999.992847443 1978 519999.980926514 1979 519999.980926514 1980 519999.980926514 1981 460000.00834465 1982 579999.983310699 1983 2250000 1984 519999.980926514 1985 699999.988079071 1986 1169999.95708466 1987 2049999.9523162802 1988 990000.009536743 1989 1789999.96185303 1990 1330000.04291534 1991 1620000.00476837 1992 1159999.9666214 1993 1169999.95708466 1994 4050000.1907348596 1995 2849999.90463257 1996 1590000.0333786 1997 17780000.6866455 1998 3710000.03814697 1999 4050000.1907348596 2000 4630000.11444092 2001 4380000.11444092 2002 9800000.19073486 2003 10560000.4196167 2004 13409999.8474121 2005 13119999.8855591 2006 14229999.5422363 2007 14890000.3433228 2008 21920000.0762939 2009 25579999.9237061 2010 28969999.3133545 2011 28389999.3896484 2012 25590000.1525879 2013 24149999.6185303 2014 21149999.6185303 2015 19559999.4659424 2016 19940000.5340576 2017 25270000.4577637 2018 27680000.3051758 2019 22809999.4659424 2020 20100000.3814697 2021 27290000.915527303 2022 27709999.084472697