Year	% of merchandise exports
1963	3.221071286450066
1966	7.634928871036103
1968	9.903084049854439
1969	10.39769405639257
1970	10.481866925085287
1971	12.128676331334914
1972	15.909527125109866
1973	13.300841437250059
1974	11.101234071650072
1975	10.313495599461929
1976	12.162304638845134
1977	11.059998505198221
1997	24.797458499662326
1998	29.06806953997031
1999	27.127878695234358
2000	20.36907625775087
2001	20.916190342522167
2002	21.052889216843734
2003	26.938471090818116
2004	20.2874683056689
2005	29.259395574982726
2006	19.626628227788853
2007	22.013802874571006
2008	24.002992816892103
2009	24.744195567709674
2010	22.130930963709766
2011	21.72275946177566
2013	24.212729388592262
2014	26.067523297122168
2015	28.774686752298635
2016	25.523410290239077
2017	32.37886884398721