Year	% of total merchandise exports
1960	6.666666666666667
1961	8.955223880597014
1962	9.090909090909092
1963	12.142857142857142
1964	11.398963730569948
1965	7.203389830508475
1966	9.12280701754386
1967	8.655616942909761
1968	6.402439024390244
1969	6.1944589649764765
1970	4.696419304618578
1971	4.9656395477721125
1972	4.9434187016081
1973	6.296333908804712
1974	6.659201194475552
1975	8.372989578941027
1976	15.97571097811367
1977	11.871276153526395
1978	9.492802289251612
1979	9.561856277546019
1980	8.35683844269214
1981	8.973218257852123
1982	6.915851462500608
1983	7.128309572301425
1984	10.842945874001774
1985	7.355003505960132
1986	5.478077656265676
1987	9.311325747552262
1988	7.28403732316645
1989	5.469085911628976
1990	6.125326258977895
1991	5.741323580624033
1992	4.637906128891768
1993	5.269897791669614
1994	3.7764718483088813
1995	2.4754779226500223
1996	2.9659209088730436
1997	4.664036839009218
1998	5.162309025620992
1999	3.3429583518740884
2000	1.9616491084443812
2001	3.4099075603421243
2002	4.3023242654556775
2003	2.991637379120475
2004	4.566864759582106
2005	5.444662658979021
2006	3.915126674990077
2007	3.2429248918028613
2008	3.507633304612591
2009	5.326041734132961
2010	3.549501932075988
2011	1.9420869008712305
2012	5.271694148875692
2013	5.56726743227544
2014	7.209524023316454
2015	5.863314755723336
2016	3.8947906625390765
2017	5.618070639192462
2018	5.221359129582388
2019	3.9660050546174332
2020	5.180442821243323