Year current US$ 1969 129999.998956919 1970 160000.00201165702 1971 129999.998956919 1972 280000.001192093 1973 379999.99523162795 1974 750000 1975 1579999.97399747 1976 4610000.13910234 1977 2380000.02130866 1978 4660000.01318753 1979 2979999.95946884 1980 6030000.01236796 1981 8629999.78847802 1982 12550000.0305474 1983 14469999.8684227 1984 18359999.958425798 1985 20410000.219941102 1986 16209999.9263883 1987 26650000.732392102 1988 30179999.9568611 1989 24650000.102818 1990 23369999.829679698 1991 233380002.76312202 1992 76139999.14377931 1993 49860000.073909804 1994 42590001.009404704 1995 37460000.038147 1996 38160000.1901388 1997 39800000.0566244 1998 36309999.9129772 1999 37020000.0852346 2000 30249999.597668603 2001 30859999.924898103 2002 43280000.7909536 2003 30480000.391602498 2004 33000000.4172325 2005 10869999.9451637 2006 10089999.973774001 2007 6870000.01221895 2008 12650000.0059605 2009 17639999.926090203 2010 96889997.4673986 2011 15069999.6948242 2012 21215400.159359 2013 4781722.05388546 2014 22619799.6623814 2015 15505381.8374872 2016 46836859.364062496 2017 30809209.9428177 2018 41701801.3447523 2019 33431694.5753526 2020 30802559.0730831 2021 46723410.204052895 2022 48580400.06458764