Year % of GNI 1990 37.963688335616226 1991 35.616087871695534 1992 36.94438294472255 1993 35.54471319891989 1994 34.29421536933773 1995 38.44837799749984 1996 38.996958901300246 1997 39.140938596049715 1998 18.192135307030174 1999 15.06468083168416 2000 17.27607089527704 2001 17.492056448239598 2002 20.75441213355493 2003 22.875212066597744 2004 25.594939903745722 2005 25.80948239394087 2006 27.55743724675666 2007 26.771893449701594 2008 29.644254071849872 2009 29.60942280700008 2010 25.533046628676935 2011 23.01161679519356 2012 22.561376890689434 2013 23.551042793167657 2014 24.73424301986378 2015 26.085509251049224 2016 30.4388038979705 2017 31.15624722932851 2018 32.070070184723924 2019 33.133451710079946 2020 37.14445119247961 2021 37.69035690813587 2022 36.52114983652401