Year % of GDP 1970 0 1971 7.78528946876279E-05 1972 7.89325222382731E-05 1973 6.84205914419255E-05 1974 0.000160226468665613 1975 0.00651254983365362 1976 0.00537154740172328 1977 0.00494512042635369 1978 0.00304842518660833 1979 0.00240910676375175 1980 0.00408095953132812 1981 0.00914507907783 1982 0.00994920947347094 1983 0.00493991351717701 1984 0.00306712489429042 1985 0.00502854192452857 1986 0.00105171234967 1987 0.000298097323420561 1988 0.00034531019491461 1989 0.000465927024367908 1990 0.00136894644448162 1991 0.00109055356172221 1992 0.000433651837049696 1993 4.77823309738546E-05 1994 4.458421667216E-05 1995 0 1996 0 1997 0 1998 0 1999 0 2000 0 2001 0 2002 0 2003 0 2004 0 2005 0 2006 0 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2014 0 2015 0 2016 0 2017 0 2018 0 2019 0 2020 0 2021 0