Year % of GNI 1991 2.67999354578078 1992 2.40096500834136 1993 2.02990665511656 1994 3.24164791169058 1995 2.83992458966837 1996 3.4458094127751 1997 3.26267177083272 1998 3.44634105396035 1999 3.39784284456824 2000 3.30326176601513 2001 3.31298752545658 2002 3.47589719780389 2003 3.5496561381134 2004 4.08365950828903 2005 4.48302323518444 2006 5.47914202466038 2007 8.75326108052455 2008 10.5059858163983 2009 14.6916920761147 2010 20.1330031908576 2011 17.7158896105281 2012 18.1794831108731 2013 20.7176723569582 2014 14.0061964081266 2015 12.3552997090878 2016 14.0773526185259 2017 15.2330290916937 2018 11.2344526325598 2019 11.5379529691064 2020 10.6997095617446 2021 9.71729983472068