Year	% of total merchandise exports
1961	4.038772213247173
1966	8.06831099479208
1967	11.462626311173056
1968	21.237811782861836
1969	17.063430720873914
1970	12.780430707639589
1971	12.17021345630493
1972	13.97650198287684
1973	17.241592139290585
1974	11.877440612796935
1975	10.506461965918136
1976	8.974905971236716
1977	7.152829673648931
1978	9.13260604863922
1979	14.815505031680953
1980	6.691516683821839
1981	6.122757518090105
1982	6.209181813992652
1983	5.00433245123065
1984	5.399037074837479
1985	5.399037074124656
1986	11.489964604025925
1987	17.869840455333254
1988	6.751538749670516
1989	17.885000951251996
1990	17.350588936506856
1991	28.556712978879478
1992	37.02529779812719
1993	11.638114168811613
1994	60.282163668677036
1995	72.33602526281075
1996	46.816212641058556
1997	0.0009308353291151211
1998	0.2852301530717874
1999	2.0008396454171772E-09
2000	0.12409635443942854
2001	0.023157951785557816
2002	0.016588776984712367
2003	0.00014961354721374637
2004	0.00015960020075478276
2005	6.225194304383722E-05
2006	2.956750011659532E-16
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	-3.0319133015031884E-16
2015	0
2016	1.13925364281229E-14
2017	0
2018	3.4752832994714855
2019	0
2020	0