Year	% of total merchandise exports
1964	0.5154639175257731
1965	0.6417736289381564
1966	0.5620232838217584
1967	0.37570444583594237
1968	0.35172565398988787
1969	0.4497269514937359
1970	0.6057007125890737
1971	0.45640834575260814
1972	0.5526218838265995
1973	0.5050035629085726
1974	0.942551381363901
1975	2.4724626278520847
1976	2.767551591828269
1977	2.18250216458833
1978	2.386170533771658
1979	2.4574028012396747
1980	3.036245720871824
1981	3.824545732352319
1982	1.8408308937055313
1983	1.489004182458206
1984	1.8968328018783773
1985	1.8715068122319756
1986	1.2540590246846175
1987	1.0104511206687028
1988	0.9234915426229401
1989	0.6934453983552188
1990	0.7485189764601694
1991	1.6946300897767046
1992	1.7753389512999878
1993	1.5871166216090238
1994	1.2927921706359384
1995	1.3202073959023322
1996	1.8971815336349573
1997	1.3463780183180682
1998	2.0000451681383953
1999	1.816034130546561
2000	1.6916344490326929
2001	1.7147782901912794
2002	1.7963517283333026
2003	1.809824448332998
2004	1.9224497034424324
2005	1.7589368958954137
2006	1.7516795677992945
2007	2.0427393437191044
2008	2.474392925662315
2009	3.138268828176613
2010	3.1425314427596143
2011	2.459640532944428
2012	2.8264052851953934
2013	2.30850496665666
2014	2.381813297652205
2015	2.0565072118642944
2016	2.1518415652093243
2017	1.7630837363396001
2018	1.4847969178217888
2019	1.2354491874338835
2020	0.8243434566085435