Year	% of total merchandise exports
1973	5.1410865772215875
1974	4.013170637226419
1975	6.477400247573434
1976	5.884114852303243
1977	2.8542809050259716
1978	2.743519966031691
1979	4.219281171552654
1980	4.053260134384581
1981	4.184549356223176
1982	2.6365955409026864
1983	3.0175852381117547
1984	4.07404987832563
1985	4.199323289144358
1986	3.8074700010960445
1987	5.532319336907502
1988	4.1252590441773185
1989	3.933587613484879
1990	4.485610846594549
1991	0.6715148894381722
1992	2.807161813762197
1993	3.037743841142706
1994	3.7818372693531535
1995	0.9623525929002326
1996	3.6567195943034743
1997	3.439503399687987
1998	3.078245507201255
1999	8.524267675465591
2000	2.238146516161425
2001	2.213864646566698
2002	2.213966727401143
2003	2.2137845856060276
2004	2.2137952385513517
2005	2.2135623644634155
2006	2.2138761541845664
2007	2.213901704111423
2008	2.214127868423276
2009	2.213901715146551
2010	2.21385620094353
2011	2.214035254963984
2012	2.213582835574722
2013	2.213582843408308
2014	2.213582833942167
2015	2.015117001908986
2016	1.6106851354746539
2017	1.2054151795083876
2018	1.5685229838106625
2019	1.6138767149332303
2020	1.9184805029821963