Year	% of merchandise exports
1963	71.94951395760154
1966	52.46388457298154
1968	55.03474678440769
1969	54.69384784284094
1970	55.37861332659096
1971	55.348819021171956
1972	39.29259761588524
1973	46.72423221703795
1974	54.530308538454804
1975	58.37063036162975
1976	59.98436076251552
1977	67.58888740938488
1997	60.38895936040621
1998	56.33068664907775
1999	59.397495664845636
2000	70.01263543197388
2001	68.33992606328482
2002	63.13707482502753
2003	57.77888717916597
2004	67.04756424202797
2005	69.38858195488723
2006	70.2230646007997
2007	66.72250329441057
2008	65.84219042754141
2009	63.682902014800845
2010	65.81097187592601
2011	64.44665193310765
2013	64.93501711401902
2014	62.8019341614166
2015	57.879814880096
2016	61.99992666803647
2017	52.47344285261683