Year	% of total merchandise exports
1960	4.393305439330543
1961	3.4420289855072466
1962	2.901023890784983
1963	1.9073569482288828
1964	1.583949313621964
1965	1.6190476190476188
1966	4.865938430983118
1967	5.004170141784821
1968	5.599369085173501
1969	6.349088553964892
1970	6.095789803766236
1971	8.479803860104788
1972	2.547018900743916
1973	1.6656087519033795
1974	0.8320032157739978
1975	1.192312551289823
1976	1.2558188268047716
1977	1.0760360580450212
1978	0.03386643619427955
1979	0.08044956601568118
1980	0.003425765041849146
1981	3.2646216937365224
1982	2.1421286580799186
1983	1.9946164746723438
1984	1.6525293441351836
1985	2.333707216240798
1986	2.6055127842512724
1987	1.732286357085349
1988	2.574663337349307
1989	3.1937098762639113
1990	1.8335687907100142
1991	1.2345041202941143
1992	1.0696375315714604
1993	1.1522489116047316
1994	0.8444860329030915
1995	1.260327125520438
1996	1.6043331555191591
1997	0.9710880145061749
1998	1.5987846064649809
1999	0.9024267103487945
2000	2.370994241429778
2001	4.6626139462646075
2002	6.646909090949628
2003	3.02921303683213
2004	3.156377908881807
2005	4.321702791842133
2006	5.114446296138424
2007	3.3597761672961037
2008	3.4421689172203744
2009	4.980547597318386
2010	3.213062228415775
2011	2.983489631794454
2012	2.8253394412384134
2013	4.770653089255353
2014	4.270725450344911
2015	3.097539850909596
2016	2.6842396754678193
2017	2.3051370961497915
2018	1.9447880199942342
2019	1.5471853075793078
2020	1.9341261442670792