Year	% of GNI
1977	32.35302179522316
1978	26.220286748163307
1981	23.02851695094507
1982	24.304620815397517
1983	25.678856283261197
1984	23.55783663772594
1985	21.124239020355656
1986	16.834684631338426
1987	20.298221684379087
1988	16.51410229651292
1989	21.122417478592507
1991	30.941300555357586
1996	30.557807023317608
1998	25.105471185872336
2014	26.05712373637749
2015	19.600956675259468
2018	26.802087598637165
2019	25.093664943232305
2020	16.018500943284167
2021	20.14089818996905