Year	% of merchandise exports
1963	3.221071286450066
1966	7.634928871036103
1968	9.903084049854437
1969	10.39769405639257
1970	10.481866925085287
1971	12.128676331334914
1972	15.909527125109866
1973	13.300841437250057
1974	11.101234071650072
1975	10.313495599461927
1976	12.162304638845134
1977	11.059998505198221
1997	24.797458499662326
1998	29.06806953997031
1999	27.127878695234358
2000	19.944691222933248
2001	20.420364755658785
2002	20.584842121271635
2003	26.38231778561607
2004	19.789386370471966
2005	28.840886703232606
2006	19.11311097518153
2007	21.495499849189674
2008	23.507511365119544
2009	24.202340085833107
2010	21.783876381031885
2011	21.320860828207703
2013	23.883897869119064
2014	25.704406631744504
2015	28.475167799883145
2016	25.194706659382344
2017	32.02022679390729