Year	% of total merchandise exports
1964	0.8732309545317676
1965	1.4006888633754304
1966	0.4648347903920581
1981	12.02388695265692
1982	11.16623506597946
1983	8.66702844878583
1984	7.075934639539992
1985	9.391944614643394
1986	6.9464060396722385
1987	8.564374785936856
1988	6.171283507525352
1989	5.174191459952235
1990	4.7022303232269484
1991	6.199534195205544
1992	8.675011553780259
1993	9.252881493981665
1994	8.442062564357537
1995	8.85893447675961
1996	10.110420790807167
1997	8.231617100394839
1998	7.883560641849195
1999	14.424363611705818
2000	8.627501798392458
2001	9.105963288131779
2002	7.969485640890469
2003	43.26951474402974
2004	16.23193465204313
2005	8.36297878052701
2006	8.9984406355388
2007	6.305692861070596
2008	3.808253418481626
2009	5.850897016104453
2010	12.405509664161823
2011	8.002290447436218
2012	2.144128917221246
2013	0.7970408601567684
2014	0.37019308926461636
2015	0.1535654372159373
2016	0.08492168802692557
2017	0.1152947833370403
2018	1.1627802093293056
2019	0.14881442021397817
2020	0.2980668874184006