Since 1951 the figures reveal a shift toward a more 'modern' and economically advanced structure. During this period the proportionate share of secondary production has virtually doubled as has that of government. The contribution of primary production has, on the other hand, fallen from three fifths to two fifths of the total. In addition goods and services sold as inputs for further stages of production total substantially over one third of value added. The proportion of imports to GDP fell from 26 per cent in 1951 to 22 per cent in 1962-63, whilst that of exports rose from 19 per cent to 23 per cent.