Year	% of merchandise exports
1963	6.454401907024472
1966	8.756740570676607
1968	8.213711702587712
1969	7.4958537256596
1970	7.449454207087193
1971	7.243408442225745
1972	5.699938355859974
1973	5.04670678419182
1974	9.130637969298084
1975	8.801109643393037
1976	7.3262547126315205
1977	8.25569270926868
1997	4.404613906797351
1998	3.8697694359756842
1999	3.6292250276344444
2000	2.4628311438843014
2001	2.3771477923317
2002	2.252063152550772
2003	2.7579319326537957
2004	2.1925113408831263
2005	4.3353713154129006
2006	2.6031645057832185
2007	2.488315671097706
2008	3.8004893583292305
2009	2.677972680556854
2010	3.006287220486502
2011	3.141104202604729
2013	2.887555825203595
2014	3.3629691179062644
2015	3.4696676771820596
2016	3.1357396123936576
2017	3.1686756179596056