Year US Dollars 1973 419999.98689 1974 17489999.77112 1975 31979999.54224 1976 17750000 1977 18870000.83923 1978 24200000.76294 1979 25559999.46594 1980 42229999.54224 1981 36970001.2207 1982 41150001.52588 1983 25479999.54224 1984 38959999.08447 1985 42919998.16895 1986 25649999.61853 1987 29200000.76294 1988 30719999.31335 1989 39990001.67847 1990 28889999.38965 1991 25579999.92371 1992 17270000.45776 1993 13270000.45776 1994 26040000.91553 1995 28299999.23706 1996 54299999.23706 1997 18120000.83923 1998 26840000.15259 1999 11920000.07629 2000 20139999.38965 2001 28850000.38147 2002 39869998.93188 2003 13420000.07629 2004 32330001.83105 2005 23879999.16077 2006 21559999.46594 2007 19209999.08447 2008 19729999.54224 2009 34250000 2010 31360000.61035 2011 21750000 2012 24639999.38965 2013 18739999.77112 2014 15180000.30518 2015 12460000.03815 2016 9229999.54224 2017 20170000.07629 2018 27110000.61035 2019 52799999.23706 2020 64239997.86377 2021 74849998.47412