Year	% of total merchandise exports
1960	57.89473684210527
1961	28.865979381443296
1962	40.340909090909086
1963	29.63855421686747
1964	12.050739957716702
1965	4.291845493562231
1966	6.511627906976744
1967	5.439330543933055
1968	48.9080348499516
1969	42.811591080469675
1970	11.846053489889107
1971	12.41987994709533
1972	4.499038034630754
1973	7.480491312445483
1974	4.139434508766301
1975	3.8230019056159623
1976	2.452347617105248
1977	6.391156699927896
1978	5.479779647264808
1979	4.9903367004043675
1980	9.90102838842921
1981	13.87227114467089
1982	4.184365704371489
1983	5.424892949854303
1984	3.817196262430169
1985	1.2139307756906228
1986	2.111382321744631
1987	5.031793772976776
1988	2.634491630069318
1989	4.182087325247539
1990	8.42801960102771
1991	12.994435291963082
1992	2.9543779840179023
1993	4.58086373129047
1994	5.361659573613825
1995	4.396580971171532
1996	31.943590547181124
1997	1.659092398657915
1998	2.471563555070512
1999	2.2454798094452144
2000	0.7106079533940027
2001	0.006665800016312741
2002	0.1286189304672157
2003	0.09383846193361996
2004	0.27026308841780367
2005	0.28250046330519507
2006	0.37267254654068016
2007	0.4400872882166172
2008	0.47599332949002754
2009	0.3934997882470274
2010	0.5680449079112001
2011	0.2790634780306316
2012	0.4315846279581702
2013	0.19682473481348645
2014	0.23275291266328788
2015	0.21958843166299738
2016	0.158729089523149
2017	0.12811997842629363
2018	0.09974030504778604
2019	0.21077995524497925
2020	0.22844071395135088