Year % of GNI 1996 0.0196265809957358 1997 0.0127397680901105 1998 0.00430560295503327 1999 0.0175317208026921 2000 0.0324554493005386 2001 0.0192339369625808 2002 0.0165298100872709 2003 0.0151719498761189 2004 0.0145120826132749 2005 0.0241737406760458 2006 0.0361894701551173 2007 0.0344935669084673 2008 0.0687133886884892 2009 0.0484970639108176 2010 0.0275451867856521 2011 0.0442682660168065 2012 0.0340268575101924 2013 0.0260040296873393 2014 0.0196559148790225 2015 0.00924223713142553 2016 0.00589830620617057 2017 0.00634309363943338 2018 0.00891013147097284 2019 0.00718430707041893 2020 0.00443306144556176 2021 0.00849473550140378