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