Year % of GNI 1990 20.9643626743665 1991 20.5029547651709 1992 21.0400707573805 1993 22.5554874480938 1994 21.3678308329876 1995 17.6757981147152 1996 18.5477182974257 1997 19.3766162187479 1998 18.3678501770792 1999 18.9034140740268 2000 17.445718703699 2001 18.9240843713503 2002 17.212574842266 2003 17.4053509785199 2004 17.3246445695243 2005 19.2608958033628 2006 17.6399349652089 2007 18.4696463102951 2008 13.0441933468765 2009 19.1546914522064 2015 26.5981362182203 2016 29.7808518113209 2017 32.0309701516639 2018 29.3658443971466 2019 25.9659258718968 2020 25.650406093097