Year % of GDP 1970 0.0424994176359864 1971 0.0286554369551272 1972 0.0279791183988341 1973 0.165745217645664 1974 0.181654933747369 1975 0.0365701571663027 1976 0.0311457416268159 1977 0.0229396618499104 1978 0.0117661828510128 1979 0.0191107121711568 1980 0.0447481333259571 1981 0.0200473223512998 1982 0.0202437012616067 1983 0.023011617304258 1984 0.0175667844338492 1985 0.0151024640872065 1986 0.0146478417395892 1987 0.0251494934966291 1988 0.0634150322076526 1989 0.0547579087271262 1990 0.0237628409725644 1991 0.00364583110377264 1992 0.00418983290503078 1993 0.00119188726036864 1994 0.00320897068959351 1995 0.0101143993602092 1996 0.00802267914165387 1997 0.00766271188819589 1998 0.0169324205287024 1999 0.010121598671448 2000 0.00865486696785494 2001 0.0103222430331056 2002 0.0111336358618988 2003 0.0129601492061124 2004 0.000367082622625252 2005 0.00157164728287481 2006 0.00204710688905323 2007 0.00242659549311644 2008 0.00392099660816901 2009 0.00235546833193462 2010 0.00478946577106454 2011 0.0052729656351211 2012 0.0208863608362155 2013 0.00424845562971992 2014 0.00229587956231499 2015 0.000831471147607381 2016 0.00115995175034279 2017 0.00103511203201852 2018 0.000308061695378874 2019 0.0810627148655371 2020 0.0843581660058351 2021 0.000483293114651688