Year	% of total merchandise exports
1961	82.26905065985525
1978	72.39020952933618
1979	74.57682147547999
1980	76.16763694098968
1981	77.23669994784294
1982	74.80092027205657
1983	75.72261399331927
1984	77.40686576664774
1985	79.3815225186985
1986	79.54462130945284
1987	79.66347372155491
1988	81.7007973143097
1989	83.97976871165419
1990	84.9377587723832
1991	88.05913564428707
1992	86.88533816315247
1993	86.29102098409246
1994	88.64426545538787
1995	87.21605161221024
1996	87.9244967353122
1997	88.03574268390526
1998	87.99981768608265
1999	88.21214244675176
2000	87.10011712795828
2001	86.45308102717154
2002	85.85926796847899
2003	85.25242964652223
2004	84.49109016250398
2005	83.60622276041762
2006	82.06902979799283
2007	79.3625835297209
2008	77.06536297913736
2009	76.8494446154486
2010	75.47332463210512
2011	74.11179236926625
2012	73.26151668716983
2013	72.25690906285905
2014	71.02020939566067
2015	71.29070121418611
2016	70.71774668981882
2017	70.09358418851888
2018	69.80800323867702
2019	67.87573628624602
2020	68.86799376833127