Year	% of GNI
1977	32.01883682325795
1978	25.69286243148635
1979	28.502515441085855
1980	26.75116523308295
1989	20.713107264766567
1991	25.961826265041026
1993	26.68675324590423
1994	26.58976429632967
1995	26.815111488361815
1996	28.81559534141833
1997	25.59474661277386
1998	24.2766446792525
1999	27.05554701211866
2000	28.322314160778678
2005	37.09348706106806
2006	38.88084677464889
2008	40.02307667370584
2013	28.723052069518786
2014	25.40809122894454
2015	18.91948080856645
2016	18.66698076599672
2018	27.452218402378836
2019	25.107473788553882
2020	19.17376058812793
2021	24.504551384535052