Year % of GNI 1990 11.6898084325608 1991 9.31034201356225 1992 7.86307636551732 1993 11.8664065087689 1994 14.4965618275931 1995 13.572164389904 1996 16.0846449857747 1997 18.8686706644426 1998 24.6578781573615 1999 22.9777861258196 2000 20.8054008186454 2001 21.8997933023722 2002 21.3991488535626 2003 19.0799958974171 2004 20.1429552592484 2005 18.3648130159887 2006 18.7146735821967 2007 18.0856245287112 2008 17.1775750496384 2009 15.2655130660073 2010 15.42832092595 2011 14.0785745383773 2012 14.4842512850078 2013 15.0629447785479 2014 16.3899909938639 2015 18.6225702050135 2016 18.5383940187808 2017 18.636419393373 2018 20.1270062619987 2019 20.0066542077578 2020 17.7860630270362 2021 21.8944833715013