Year	% of GNI
1977	32.018836823257956
1978	25.69286243148635
1979	28.502515441085848
1980	26.751165233082943
1989	20.713107264766567
1991	25.961826265041033
1993	26.686753245904235
1994	26.58976429632967
1995	27.101830224512913
1996	29.117356281975194
1997	25.88715828190776
1998	24.52384216042651
1999	27.352500726312165
2000	28.580664234946855
2005	37.541891366622494
2006	39.278564312118256
2008	40.17040038733564
2013	29.01664620268195
2014	25.65958447878879
2015	19.05608266950022
2016	18.813078697351894
2018	27.719496412788775
2019	25.310808682280097
2020	19.327361882627493
2021	24.719674858769032