Year % of GNI 1994 32.5753047655957 1995 23.6840039255264 1996 20.2382310887929 1997 19.0321942708515 1998 18.7199519752112 1999 23.087979575698 2000 22.3498500078816 2001 23.0386210059319 2002 25.1107330682661 2003 25.0979639503949 2004 29.199833765504 2005 22.9844736956676 2006 20.4745181237032 2007 21.1563535849993 2008 17.0967699572899 2009 12.7823567324831 2010 14.4826163643728 2011 12.3287936471063 2012 12.4335481796727 2013 8.00336152767994 2014 10.0161403122952 2015 20.5967473592952 2016 19.5295363274478 2017 16.6222842054694 2018 13.4908904334029 2019 12.1342335960932 2020 11.9582540134711 2021 12.8013546119934