Year	% of merchandise exports
1970	55.629686667951326
1971	59.819838358894906
1972	60.95612770719262
1973	47.48059027147969
1974	74.36608494923357
1975	69.41492167905992
1976	66.06034017336884
1977	71.71316892795548
1978	73.53898610116039
1979	70.89784670041382
1980	71.58502611624479
1981	69.24324553737232
1982	55.8386804277934
1983	71.11316949099101
1984	71.18082949623968
1985	72.1954223094037
1986	64.07676958281657
1987	64.15473784501583
2002	11.350111345659881
2003	13.734572241618576
2004	11.367852083816738
2005	15.132114468473375
2006	19.07464442848708
2007	31.660246284533628
2008	43.55264328512718
2009	36.31843251461066
2010	37.501616248894095
2011	32.123032584895945
2012	29.467190067730716
2013	23.94694255548868
2014	27.802615028492006
2015	14.634278619371566
2016	23.747506352144807
2017	23.523502895096172
2018	20.148573441407045