Year % of GNI 1995 13.3803511768986 1996 13.9180545995716 1997 9.26855634946775 1998 13.3876534784236 1999 11.3149002844234 2000 4.23830348807011 2001 7.98204817794114 2002 21.0152904201764 2003 15.8793611015531 2004 14.3562191909644 2005 13.9829957300101 2006 16.5404998444326 2007 18.2437265131245 2008 15.1829808585588 2009 12.9052849461941 2010 15.8348076312045 2011 16.3628179841259 2012 11.4226063359469 2013 16.3928941442314 2014 15.6983156444809 2015 16.5557977949146 2016 19.5330816590811 2017 19.7555147585553 2018 17.4416030796625 2019 15.8780796168928 2020 16.8336809397398 2021 17.078803322923