Year	% of total merchandise exports
1963	100
1981	1.478182056855847
1982	1.1303463334237072
1983	1.8134833337252556
1984	11.128422489970836
1985	24.17689555115273
1986	28.12597313022121
1987	30.002143779282008
1988	28.287422722181084
1989	28.878850490026263
1990	3.9907112050797515
1991	2.6203885685355677
1992	3.034854175504129
1993	0.8786248745821954
1994	0.8007940229356277
1995	0.5445504742079275
1996	0.438409219569464
1997	0.26934979002921683
1998	0.10207737641496759
1999	0.009307820103021766
2000	0.9943039191196897
2001	1.4369890226458724
2002	1.5299461676152795
2003	11.556540193907187
2004	15.882098478586022
2005	18.950625003140402
2006	34.92191094004324
2007	34.48598580665764
2008	28.623630704771035
2009	23.762147935608287
2010	26.176498672399433
2011	24.31526480172545
2012	23.89096604815258
2013	19.255549521369833
2014	16.272366187899152
2015	17.34737142719098
2016	16.192520397434105
2017	17.681165447113994
2018	22.04907964391294
2019	21.69761980363986
2020	20.350777475088538