Year	% of total merchandise exports
1964	12.195121951219514
1968	4.743083003952568
1970	0.07888879497365678
1971	0.016615435739802276
1972	3.2826951646139837
1973	6.179829007516783
1974	17.19713407114871
1975	17.611801412228363
1976	10.116280445248826
1977	11.091224296515081
1978	8.82674096805166
1979	0.07060684227372861
1980	13.349808265871324
1981	11.868187722369685
1982	5.957050613377932
1983	7.387006875616986
1984	4.17261579575041
1985	0.2518730170157993
1986	3.727369999723603
1987	0.32186143194809985
1988	5.494866678385771
1989	5.66214148217584
1990	10.31702789791351
1991	29.21171854344821
1992	32.58913092148858
1993	27.80231497393763
1994	23.117089866204193
1995	35.37771604517283
1996	31.776186103049
1997	31.007845140656954
1998	22.092898347917995
1999	24.47657049089028
2000	0.0005039857510440482
2001	6.55210759748057
2002	4.977634392028262
2003	6.62737816605742
2004	13.436320537423777
2005	11.96935149428714
2006	11.70334989309791
2007	7.852571793942249
2008	9.572376285889508
2009	9.183291522332294
2010	4.77257845566106
2011	7.108919414372368
2012	11.959087418918077
2013	8.051159795022276
2014	7.776863547325953
2015	6.730743046157082
2016	5.678022642103775
2017	2.9418747267089507
2018	3.008426599568869
2019	4.798945108838122
2020	4.645674949389253