Year	% of total merchandise exports
1960	0.23881547524279573
1962	0.44480138382652745
1963	0.30284675953967294
1968	1.432209784932713
1969	1.0047460691570076
1970	1.3605223583244432
1971	1.5514328139133997
1972	1.436531151460945
1973	1.5929372595038616
1974	2.838963736252438
1975	4.1512043503423435
1976	4.381707175480896
1977	4.433411849972821
1978	5.11350634682904
1979	5.950941905624168
1980	5.802735515220164
1981	6.097489807547326
1982	5.487304665090984
1983	4.63703764425135
1984	5.155320964715815
1985	3.594333516017355
1986	2.9702422867738383
1987	2.724513395391038
1988	2.3913168080743117
1989	2.1311027604419
1990	2.228787256061737
1991	2.782784708585139
1992	2.5164540040428016
1993	2.059895238914365
1994	1.645602142321801
1995	1.4505177125133255
1996	1.4074414051675788
1997	1.4742117334282274
1998	1.8344363858172223
1999	1.4527425242797636
2000	1.3540471473277023
2001	1.6147655541510022
2002	1.658015716464754
2003	1.5148734152542902
2004	1.5396429924461643
2005	2.2661023263412403
2006	1.909692732162935
2007	1.9564999027451926
2008	2.2232751971703215
2009	2.179780343655589
2010	1.8311523640977316
2011	1.7923957412622364
2012	1.9650723780328565
2013	2.2207993286799477
2014	2.241815871394084
2015	2.2498834506301026
2016	2.123589235484544
2017	1.7027232575546485
2018	1.5931201510535977
2019	1.9092195544896569
2020	1.6617566357172382