Year current US$ 1970 360000.01430511504 1971 300000.011920929 1972 349999.99403953605 1973 180000.00715255702 1974 219999.998807907 1975 490000.009536743 1976 119999.997317791 1977 540000.021457672 1978 1480000.01907349 1979 689999.997615814 1980 720000.028610229 1981 759999.990463257 1982 740000.009536743 1983 1399999.97615814 1984 1149999.97615814 1985 1600000.02384186 1986 1740000.0095367401 1987 1539999.96185303 1988 2150000.09536743 1989 2960000.03814697 1990 2160000.08583069 1991 2599999.90463257 1992 2849999.90463257 1993 4389999.8664856 1994 4739999.771118159 1995 7570000.17166138 1996 9020000.45776367 1997 2470000.02861023 1998 2099999.90463257 1999 1570000.05245209 2000 2589999.91416931 2001 2190000.05722046 2002 2759999.99046326 2003 2589999.91416931 2004 4210000.03814697 2005 2970000.02861023 2006 2819999.9332428 2007 5030000.20980835 2008 4690000.05722046 2009 2359999.89509583 2010 2319999.9332428 2011 3470000.02861023 2012 2243671.41723633 2013 2675398.82659912 2014 6139963.150024409 2015 5720280.64727783 2016 4417922.0199585 2017 10164059.638977101 2018 9510051.72729492 2019 7492000.10299683 2020 8133999.8245239295 2021 6710999.96566772 2022 6881000.04196167