Year % of GNI 1994 4.24220227484421 1995 3.17115127457687 1996 2.6011044465376 1997 4.08155582131644 1998 3.73956383184291 1999 3.4494037307077 2000 4.25051357992988 2001 4.25124875366294 2002 4.09856724944081 2003 3.50956072454647 2004 3.09449744662645 2005 3.22994741005033 2006 3.31324957500048 2007 2.99415318395331 2008 2.81119863073218 2009 3.10867673201775 2010 3.41174908465196 2011 3.76768951037989 2012 3.92994153421908 2013 3.83434712189494 2014 3.50741900932332 2015 4.17987761890293 2016 4.73695578465873 2017 4.73338839332455 2018 4.41264784583044 2019 4.26028030001763 2020 4.24947173524422 2021 4.11312595244778