Year	% of GNI
1971	26.0468475246345
1972	24.9099851346875
1973	24.6368666725994
1974	23.4800104546603
1975	19.9396740808845
1976	20.4386607670172
1977	20.1808525323191
1978	21.0004841831593
1979	20.517199296383
1980	19.2967750686967
1981	17.9636324810471
1982	18.2905011971717
1983	18.7975916196814
1984	19.3364683163882
1985	20.1252077066653
1986	21.6752684870266
1987	20.876361420328
1988	21.9353291173058
1989	22.9032336158126
1990	24.140929608696
1991	23.6299209473865
1992	23.4397404787575
1993	22.4742926548208
1994	22.7537879579404
1995	23.0696586642646
1996	22.518306350015
1997	22.8292753117835
1998	23.3596477527005
1999	22.7205806296591
2000	22.7971559048002
2001	22.7000939757616
2002	22.8823394881228
2003	22.0200640069404
2004	24.1749160413263
2005	23.9333588896086
2006	25.9003674200922
2007	27.8628523792485
2008	26.8933887222555
2009	23.8588911252477
2010	25.2694810849714
2011	27.1279122703075
2012	26.1722947962722
2013	25.9807802544518
2014	27.0436984382152
2015	27.6979684932986
2016	27.8352342043611
2017	28.2108138087638
2018	28.921335439399
2019	28.7363385898022
2020	28.274958500161
2021	29.6049472535525