The composition of GDP also changed markedly from 1961 to 1973. The share of the primary sector (agriculture, forestry, and fishing) in GDP shrank from 23 to 16.8 percent, and the contribution of the secondary (or industrial) sector (manufacturing, construction, mining, electricity, gas, and water) increased from 37 to 44 percent. The services sector's share in GDP remained constant at 39.4 percent. Within the industrial sector, the contribution of manufacturing advanced from 30 to 35 percent and that of construction from 4.6 to 6.4 percent.