Year	% of total merchandise exports
1974	84.5809426149306
1975	84.48006384889096
1976	82.50868828351172
1977	80.93829984207373
1979	68.07607912358404
1980	64.2142310036173
1981	66.51852333199501
1982	63.549933044842575
1983	62.312449326741174
1984	58.55547556247155
1985	58.555475559269254
1986	58.555475557887604
1987	58.55547555973914
1988	20.132783714246603
1989	20.13278371769423
1990	12.874807481206702
1991	67.6963518089707
1992	62.3350381062527
1993	59.96859405308174
1994	30.616304491502593
1995	28.158276149969698
1996	24.0622677425938
1997	28.05046920222925
1998	25.922104127053586
1999	24.079563023301677
2000	77.29168681146047
2001	75.52477350236495
2002	79.72094149683761
2003	78.15009516856864
2004	80.74376235201164
2005	79.4078228552543
2006	77.30178209661031
2007	79.13032462814787
2008	79.10475242783224
2009	77.52696095232243
2010	73.85333247328317
2011	73.69897576791719
2012	73.31276342945296
2013	81.35231890823492
2014	73.02459368881863
2015	89.14313712943415
2016	82.93173732617623
2017	76.42717001481523
2018	70.84539244988139
2019	71.57653680378414
2020	72.91817953598627