Year % of GNI 1990 15.2059824570287 1991 14.2673340943674 1992 11.5175026391395 1993 7.52981411160934 1994 13.0805989488082 1995 15.4668980896408 1996 20.2237770504771 1997 22.389408301056 1998 18.8798746893057 1999 20.378508267246 2000 24.1886471045999 2001 20.2778158045182 2002 18.7724305379919 2003 17.5962893628837 2004 22.9940993329502 2005 26.3826054360258 2006 27.2252443585534 2007 26.3302451029716 2008 31.1866987503318 2009 20.0334952540278 2010 29.9736418143327 2011 27.7599807517657 2012 23.4259175077309 2013 16.7586386291357 2014 7.22278870789034