Year % of GNI 1990 1.82584880858859 1991 1.61119890937665 1992 1.63608376744581 1993 1.52039170479844 1994 1.38212041695522 1995 1.28347694367828 1996 1.18672338535253 1997 1.0925952476784 1998 0.997739437605311 1999 1.05812710086955 2000 1.06167934302703 2001 0.941737160088686 2002 0.842503029568187 2003 0.799244336908967 2004 0.79201852128615 2005 0.687691482702079 2006 0.694995847175562 2007 0.622211349228296 2008 0.590240992289252 2009 0.531055317837726 2010 0.47912873033709 2011 0.438239295407835 2012 0.385064931681862 2013 0.356782115115408 2014 0.329286750444491 2015 0.330297446334489 2016 0.309864615082782 2017 0.292085614898668 2018 0.290522738726877 2019 0.286842523790586 2020 0.285901766060741 2021 0.31782343554426