Year % of GNI 1993 29.443914376141 1994 29.9221563310134 1995 31.5219435405865 1996 30.8141818711433 1997 28.3485396648893 1998 30.3746374535692 1999 28.9306162871348 2000 29.3103023545332 2001 29.5298670500282 2002 27.8037837242389 2003 26.2444369496514 2004 27.2040148547428 2005 28.0790944884197 2006 28.1161928263103 2007 29.7450681810083 2008 28.8659990742592 2009 25.0097510969678 2010 24.4900662593258 2011 24.4324212552081 2012 25.6743867943402 2013 25.7460423325011 2014 27.1759521997698 2015 29.0888154310916 2016 28.2555721500745 2017 28.9127617344525 2018 28.5128044517626 2019 28.687140920614 2020 28.8637107580736 2021 29.4891666129401