Year % of GDP 1971 0 1972 0 1973 0 1974 0 1975 0 1976 0 1977 0 1978 0 1979 0 1980 0 1981 0 1982 0 1983 0 1984 0 1985 0 1986 0 1987 0 1988 0 1989 0 1990 0 1991 0 1992 0 1993 0 1994 0 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 0.0166382187818553 2011 0.0288123870707702 2012 0.0230878177338188 2013 0.0251947780243645 2014 0.0225273671136455 2015 0.00766330802518443 2016 0.00658707205828154 2017 0 2018 0.00146974382203769 2019 0.00284249270710658 2020 0 2021 0