Year	% of total merchandise exports
1964	0.16051364365971107
1976	0.5373428313808213
1977	0.6030985114740541
1978	1.50398730481374
1979	0.5319626622433292
1980	0.31542746993581927
1981	0.5812801566397053
1982	0.4704118834553617
1983	2.5368491700869926
1984	4.779770354704445
1985	7.185197699443958
1986	8.383901225114855
1987	6.193308317977593
1988	5.580997949419002
1989	3.536494570190121
1990	3.0150326388269084
1991	1.729169388950478
1992	1.9620766579090045
1993	2.4698048931327103
1994	2.332406906212938
1995	1.4748647081839048
1996	2.2434345368591018
1997	1.3114994774645337
1998	4.288964892351768
1999	2.1585958532750955
2000	1.5710787735915146
2001	2.8170748471323193
2002	4.33020763637951
2003	9.081598745254187
2004	15.454799165895869
2005	14.008843966284903
2006	15.639647759494194
2007	16.294539177001994
2008	9.447940750588115
2009	16.89690784739264
2010	6.724333649551214
2011	8.978393436952297
2012	15.325642186719692
2013	16.492499713117965
2014	24.318424654698116
2015	41.374868507008685
2016	40.178793949075036
2017	40.03327481446541
2018	36.12930284441671
2019	40.06023349971974
2020	42.72868928426539