Many countries with low access rates also have large disparities in access between urban and rural areas. While 97 per cent of urban residents in Cambodia had access to electricity in 2012, this was the case for only 18 per cent of rural residents. Solid fuels, such as wood and other types of biomass, is the primary source of energy for four out of five people (84 per cent) in low income countries, nearly two thirds (61 per cent) of people in lower middle-income countries and more than a third (39 per cent) of people living in upper middle-income countries. ( This situation is caused largely by the unreliability and lack of affordability of electricity services. In some places, however, people find that cooking with traditional fuels and technology makes the food taste better.