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	10.15152260957321
1974	9.356158101892213
1975	7.313073858466643
1976	5.648625922256132
1977	4.1895033621874385
1997	1.3439322887988743
1998	1.4164074659920711
1999	1.541823285347268
2000	0.9566891552073451
2001	1.0278499540734947
2002	1.1801869902257234
2003	1.3715215808474666
2004	1.0187165097095308
2005	0.6423351287050041
2006	0.4984347764715558
2007	0.49118340801218324
2008	0.4228356675200932
2009	0.5447431633987523
2010	0.5720437584803183
2011	0.47098369459241135
2013	0.5317398254433442
2014	0.5130913992390815
2015	0.5811216625655675
2016	0.4803741578349573
2017	0.5057630910002335