Year	% of total merchandise exports
1981	96.06344135746566
1982	95.30292716221537
1983	72.75524476643383
1984	88.07474455204702
1985	96.4539731751002
1986	95.05398136260712
1987	96.09756090070958
1988	98.01553791588236
1989	99.08574952713913
1990	96.18329458671094
1991	96.71750296649705
1992	98.71194329068085
1993	94.07174327345686
1994	85.41667322409704
1995	96.89930200043226
1996	92.37094079911593
1997	91.5200709308251
1998	93.1177265245676
1999	94.22492415874106
2000	93.53187288009558
2001	88.9997445373097
2002	92.98478828435337
2003	92.58026084397785
2004	93.87636946677176
2005	86.50130183524465
2006	83.2542852339801
2007	81.54057939284785
2008	80.126327636774
2009	78.57985694286211
2010	82.0265463009728
2011	76.26790761020067
2012	80.32087873786124
2013	82.27898460000603
2014	81.65316718461457
2015	86.90638523416241
2016	85.05012572273654
2017	79.03043191239645
2018	84.27941360187788
2019	83.1978053006187
2020	81.82043392317233