Year	% of total merchandise exports
1960	7.962032898677602
1961	8.32046507403034
1968	1.8371247610838364
1969	2.3908075573723004
1970	2.4781180668593703
1971	2.446428571428571
1972	2.3562213899292552
1973	2.168062914697599
1974	3.1685076917223625
1975	3.4751554925202073
1976	4.698269913049126
1977	4.6619138274661
1978	5.195191602305965
1979	4.812248304800523
1980	5.509413195584515
1981	7.482101222567805
1982	9.33451788891265
1983	8.318001767391511
1984	7.309737365057199
1985	6.909892445930317
1986	4.452398839890978
1987	3.8656710951112694
1988	3.9364717973678416
1989	3.2221765552633896
1990	3.1616675164888157
1991	3.843916723494725
1992	2.2921327367636093
1993	2.0028612303290414
1994	1.075786769428388
1995	1.9966722129783694
1996	1.2019026130689279
1997	0.8638508812069567
1998	0.9242803829437919
1999	0.5424847380139413
2000	0.49990127872123896
2001	0.5051915491693255
2002	0.48565395199885175
2003	0.47661089377019905
2004	0.5095869702816497
2005	0.9614944562469844
2006	0.9525310107270089
2007	0.9704923066560786
2008	0.937156435598051
2009	0.6783437758634522
2010	0.5520934150126914
2011	0.5972811679638106
2012	0.6666353941043609
2013	0.7848934587871966
2014	0.8285720787908372
2015	0.8449441105236142
2016	0.7395755482294764
2017	0.65341781189041
2018	0.5523626667949705
2019	0.571002592146821
2020	0.5399426935192958