Year	% of total merchandise exports
1963	11.599254275755856
1964	12.840174409863177
1965	14.717412610258085
1966	18.92259264558592
1967	18.88111888111888
1968	20.533174571674273
1969	25.056393209070404
1970	26.859240344717524
1971	22.491058278981697
1972	1.3177239313912334
1973	1.1828001149944556
1974	1.1779228387312746
1975	16.729454859508316
1976	26.785082442856133
1977	21.27224649775894
1978	43.63397136079444
1979	29.397346231779853
1981	2.6061007955396835
1982	32.425877183441735
1983	17.895611098133873
1984	19.50035673361728
1985	24.970856971567507
1986	12.701634671446154
1987	13.530293729937512
1988	18.179826816216867
1989	22.18365643934355
1990	15.897833171781626
1991	7.406008865539321
1992	5.080595545936781
1993	11.695968798561807
1994	10.427074544620696
1995	4.607919040367094
1996	5.496219563017205
1997	7.687967313237742
1998	5.252709323936183
1999	4.9288811821381024
2000	4.043497983606644
2001	4.801128105909187
2002	5.614067378212251
2003	8.13495768926112
2004	8.243765254132654
2005	10.350210555941224
2006	18.74505941617424
2007	20.619862745927158
2008	22.9127201965069
2009	8.558061136686275
2010	12.349824138791925
2011	15.298171460679521
2012	13.226579698721523
2013	12.259290804318738
2014	15.680130154143102
2015	11.677092094359505
2016	9.181515307027176
2017	10.318545602720693
2018	13.305150175465446
2019	13.664377665426922
2020	20.46958216517508