ocr: Year Total Percent of Production Production (quad. Btu) Coal Petroleum Natural Gas Other 1960 41.5 26.1 36.0 34.0 3.9 1970 62.1 23.5 32.9 38.9 4.7 1980 64.8 28.7 28.2 34.2 8.9 1.Includes hydropower, nuclear power, geothermal energy, and others. Figure 3. Energy Production by Major Source from 1960 to 1980. Source: U.S. Energy Information Administation, Annua' Energy Review,
