Year	% of total merchandise exports
1981	77.892862940594
1982	72.99480360962211
1983	77.31934946939701
1984	84.22978403309153
1985	91.79953585150989
1986	93.66713012522018
1987	86.49980757991462
1988	92.18437948270899
1989	90.87107789401463
1990	92.36867388648456
1991	92.63050582397719
1992	91.96442517940156
1993	87.65598762891432
1994	90.61333431519888
1995	90.83452355195034
1996	92.48695989253135
1997	91.8904930160753
1998	91.98267489843062
1999	92.20708338242297
2000	90.27312949547023
2001	87.67944519812663
2002	85.46358205003153
2003	81.54121912963424
2004	66.6978284506041
2005	81.48666741302222
2006	84.19451048605896
2007	81.70644590521161
2008	86.7363730469978
2009	91.11982561202421
2010	90.94169479933342
2011	88.0641021431614
2012	85.95198476293342
2013	85.61376985354873
2014	87.57378987908342
2015	87.38405131712383
2016	82.40212302799165
2017	78.09451096297155
2018	76.5339989038503
2019	77.32794957998689
2020	78.12553964463133