Year	% of merchandise exports
1962	0.9002064795235196
1963	1.0161834155068612
1964	0.7127577807244084
1965	1.0063943799255188
1966	0.7455063419641791
1967	0.6062085975798238
1968	0.12181665145179403
1969	0.7031193425889182
1970	0.2190490875382899
1971	0.1594566239524838
1972	0.5271182065096439
1973	0.5129182163786222
1974	0.2817216000591369
1975	0.8233658960211622