Year	% of total merchandise exports
1971	0.0851265074485694
1972	0.15144958892254434
1973	0.09699027066347407
1974	0.04043174067433112
1975	0.0027683001944730887
1978	0.007934251502548879
1979	0.009235443786162536
1980	0.03126821449387993
1986	4.430283964478372
1987	3.9072688415260584
1988	2.3643737233729403
1989	5.851081586461161
1990	8.478544065006085
1991	0.3106087856503514
1992	5.702902383985513
1993	6.390958623490964
1994	3.986894939265965
1995	5.156228350175382
1996	2.75845458423161
1997	3.7765206705264234
1998	6.8238367341395305
1999	4.262814228109657
2000	3.657922860652029
2001	6.9868805041061615
2002	6.437121832159757
2003	5.689901498374572
2004	3.9207265916385903
2005	2.2585729205698124
2006	2.1386699246710363
2007	3.1317621781574196
2008	3.0834168094549326
2009	4.780684310015566
2010	3.44606060557435
2011	2.203962229447045
2012	3.379642796479132
2013	2.175306468381128
2014	2.2627740871128275
2015	4.832680060158415
2016	6.973150651658311
2017	4.480758548784633
2018	3.7359122780376364
2019	4.193656341343857
2020	4.1936563299275935