Year	% of total merchandise exports
1967	0.19342359767891684
1971	0.6618106139438086
1972	0.45414825663684144
1973	0.5858136468409345
1974	0.03523371698936278
1975	0.016808810740099246
1991	0.4120454138124913
1992	1.2817020068318463
1993	0.10117512081551959
1994	0.3794406217287922
1995	0.5693181008479206
1996	0.34139949324848895
1997	2.9055032568777515
1998	0.9221243657106957
1999	1.155183879111887
2000	3.8588060729515283
2001	2.123318071406631
2002	2.378868088377534
2003	1.2408602581927746
2004	0.7982507737187162
2005	2.766257150269048
2006	0.9912968785890437
2007	1.5326371436003718
2008	4.100301664282859
2009	5.666015662166202
2010	5.56263976198795
2011	6.525344107864135
2012	7.4814457329004185
2013	7.967572839657873
2014	6.958672434465779
2015	6.947418825295433
2016	7.466485442795539
2017	6.089849160354601
2018	4.681898976654153
2019	4.962600619891391
2020	4.124621709694319