Year % of GNI 1990 8.62893852465028 1991 5.3725800665021 1992 7.22458649806246 1993 5.23218399119671 1994 3.5358371197694 1995 9.91409696627973 1996 11.1046931476139 1997 11.1805291573404 1998 18.8699399253592 1999 15.4744956244505 2000 17.2105177087214 2001 17.4786641819399 2002 20.6909545489205 2003 22.7839157237505 2004 25.470438122506 2005 25.6632092993665 2006 27.4529444811356 2007 26.6922959043254 2008 29.582114202814 2009 29.5548409926208 2010 25.5317486916873 2011 23.006948722597 2012 26.1986625155639 2013 27.4407581184142 2014 28.206567049599 2015 25.8142776756761 2016 28.6319834972474 2017 31.2472863057014 2018 31.8833541532364 2019 35.1806677062231 2020 34.6568939251297