Year	% of total merchandise exports
1970	3.125
1974	2.963473466574776
1975	5.281173594132029
1976	3.974503187101612
1977	20.552834730638335
1979	1.2082444918265813
1980	7.466859049508521
1981	9.51048951048951
1982	2.849986206544314
1983	12.135456123089133
1984	10.853600167688468
1985	20.070020020430682
1986	27.786031890403496
1987	6.993768645544038
1988	28.806089876215346
1989	15.199881690864467
1990	37.81952876408772
1991	65.7653758568574
1992	21.288012870420218
1993	25.51070613472494
1994	42.860792603814204
1995	42.18605066262082
1996	17.295920456774013
1997	54.98457231833933
1998	40.758458528150975
1999	52.241318800740174
2000	13.25703399798059
2001	70.42063335875442
2002	68.58407131537543
2003	34.5864608609391
2004	62.458567032760094
2005	50.72356460648321
2006	30.850085115563846
2007	89.20439634771878
2008	84.75933694790409
2009	80.764322199624
2010	89.65023099494474
2011	87.34516135548465
2012	91.08303741227476
2013	60.311810322552695
2014	86.58840743723292
2015	80.97234151648604
2016	87.07526329321884
2017	89.29030432998496
2018	81.27391534071751
2019	55.3708012226071
2020	67.84657001070431