Year	% of merchandise exports
1963	4.106908658001899
1966	10.156507200152955
1968	8.092968047182056
1969	7.631112077110846
1970	7.98917414004502
1971	8.641574269545623
1972	12.759686441451366
1973	10.151522609573211
1974	9.356158101892213
1975	7.313073858466643
1976	5.648625922256132
1977	4.189503362187439
1997	1.3439322887988745
1998	1.4164074659920711
1999	1.541823285347268
2000	0.9471874314901815
2001	1.0141874367873012
2002	1.1497291648507952
2003	1.3455500048843223
2004	1.0011051656095191
2005	0.6114931407932287
2006	0.48918121988118535
2007	0.4638279699067731
2008	0.4179952538919894
2009	0.5387515430917679
2010	0.5638585704686888
2011	0.46050437197215077
2013	0.45655417081122124
2014	0.5010779341188617
2015	0.5784912488116212
2016	0.47838018677257726
2017	0.5050300184169948