Year	% of total merchandise exports
1964	0.6523320496362859
1966	0.08693132425383947
1967	1.3319645640850157
1968	0.3154988826081241
1969	1.3798598426957918
1970	4.766676424073554
1971	6.608052740755572
1972	2.346109879793842
1973	2.4341672210664895
1974	2.5200626763126763
1975	2.5350741532603407
1976	2.6649127328505227
1977	3.2365561437726384
1978	3.2526655546863084
1979	4.226468091045488
1980	3.623886300875254
1981	2.9656285661188186
1982	5.611496979997767
1983	5.611496979644474
1984	14.901777152247309
1985	12.917142778435453
1986	11.801623073342274
1987	14.128793876691454
1988	8.14210216274575
1989	7.750540892342789
1990	14.023317414797914
1991	11.613837153334803
1992	15.608578497250637
1993	14.90327719963055
1994	17.90100439277751
1995	15.771625400402023
1996	19.842460250558272
1997	13.712298403040188
1998	8.183284839563253
1999	5.745994360055024
2000	0.12583221666163474
2001	0.8551682060947782
2002	0.6105191660792629
2003	2.106209969722873
2004	2.4044008946313125
2005	15.830128802889831
2006	17.07741172429754
2007	11.201085617951248
2008	7.840725966927733
2009	12.031539084504814
2010	20.647183924027477
2011	17.35611487898712
2012	19.331889282377833
2013	21.34390752679357
2014	8.50596454861536
2015	14.847506703444646
2016	18.600432463421107
2017	16.137942282104838
2018	14.464784358023744
2019	20.651402436206094
2020	18.758538950387553