Year	% of merchandise exports
1963	6.454401907024472
1966	8.756740570676609
1968	8.213711702587712
1969	7.4958537256595985
1970	7.449454207087195
1971	7.243408442225745
1972	5.699938355859975
1973	5.04670678419182
1974	9.130637969298084
1975	8.801109643393037
1976	7.3262547126315205
1977	8.255692709268681
1997	4.404613906797352
1998	3.869769435975685
1999	3.6292250276344444
2000	2.463650012339603
2001	2.3853642010751104
2002	2.2640101804441217
2003	2.7600367829304884
2004	2.1892312013131145
2005	4.311468570116072
2006	2.625860132213715
2007	2.565916359126958
2008	3.898738335298949
2009	2.7290141162272965
2010	3.0825789139250372
2011	3.2584450986224924
2013	2.970896170725844
2014	3.4373349531576873
2015	3.5247938082631043
2016	3.1681929718048116
2017	3.2275302610502288