The most common rural dwelling is round, windowless, and made of wattle and daub or sun-dried mud bricks, with a floor of packed earth and a conical thatched roof. Urban dwellings are usually one-story rectangular frame or mud-brick buildings, generally without electricity or indoor plumbing. Conakry has a serious housing shortage. According to the latest available information (1980–88), the housing stock numbered over one million units, with 5.4 people per dwelling. In 2000, 72% of urban and 36% of rural households had access to improved water sources. About 94% of urban and 41% of rural households had access to improved sanitation systems.