Year current US$ 1974 310000.002384186 1975 970000.028610229 1976 1200000.04768372 1977 1379999.99523163 1978 239999.994635582 1979 79999.9982118607 1980 59999.9986588955 1981 150000.005960464 1982 1149999.97615814 1983 1600000.02384186 1984 1860000.01430511 1985 4429999.82833862 1986 4340000.15258789 1987 5199999.80926514 1988 4900000.09536743 1989 2109999.89509583 1990 1279999.97138977 1991 930000.007152557 1992 1110000.01430511 1993 379999.99523162795 1994 29999.999329447703 1995 29999.999329447703 1996 29999.999329447703 1997 29999.999329447703 1998 59999.9986588955 1999 109999.999403954 2000 39999.9991059303 2001 19999.9995529652 2002 150000.005960464 2003 500000 2004 3299999.95231628 2005 6039999.96185303 2006 150000.005960464 2007 3509999.99046326 2008 439999.997615814 2009 2380000.1144409203 2010 90000.0035762787 2011 109999.999403954 2012 230000.004172325 2013 239999.994635582 2014 79999.9982118607 2015 180000.00715255702 2017 109999.999403954 2018 150000.005960464 2019 340000.00357627904 2020 850000.023841858 2021 479999.989271164 2022 1500000