Year	% of GNI
1975	19.8747104194117
1976	14.9685842287306
1977	16.3735405201628
1978	16.2780317496239
1979	16.0817762612483
1980	25.3419349288643
1981	23.3331403292974
1982	24.3475555386008
1983	22.690861744662
1984	26.0895851510969
1985	26.3952082461103
1986	27.176694453037
1987	26.6344172012043
1988	27.9895240486472
1989	28.7334114528449
1990	31.3337135339927
1991	26.9878263293693
1992	27.318363945578
1993	25.7288765026693
1994	24.4581632836998
1995	22.5559204027356
1996	25.1991853218046
1997	25.3942776756005
1998	28.0519493425525
1999	25.9788434605201
2000	25.6977289221238
2001	32.368438266936
2002	31.3381590580318
2003	32.699787529805
2004	33.0749911958711
2005	32.5288739181636
2006	33.7712133069257
2007	34.0515737337658
2008	34.239805804565
2009	30.1948826049512
2010	30.1297879394974
2011	28.5502686461733
2012	25.771776003996
2013	27.3992671253598
2014	25.8367483367757
2015	28.7033091478946
2016	28.667338478491
2017	29.0393435570702
2018	27.7378700707331
2019	27.6469615628014
2020	27.9644854781152
2021	29.2156487755407