Year % of GNI 1990 4.37727848359792 1991 4.61031119395209 1992 4.86692248342784 1993 4.2808161891645 1994 4.12771624328481 1995 3.75169536000503 1996 3.34337271131578 1997 3.35182114081594 1998 3.44890235462329 1999 3.22727383026388 2000 2.99927142953604 2001 2.77148502394972 2002 2.6834552485818 2003 2.67857416351246 2004 2.32034545050919 2005 2.12132676523506 2006 1.9351191842794 2007 1.79631961466105 2008 1.70839689026958 2009 1.62390287667743 2010 1.4759787957113 2011 1.37406915434818 2012 1.29311496079583 2013 1.18989262994233 2014 1.13423718035985 2015 1.05290142382416 2016 0.986585720464185 2017 0.939517998845649 2018 0.90465744601674 2019 0.850416088083144 2020 0.806109828406821 2021 0.751516232437477