Among other efforts to eliminate substandard housing conditions, the government has undertaken housing renewal projects in both rural and urban areas and has sought to provide housing for workers on industrial estates. Another government program supplies building materials at low cost to working people. By the 1980s, a majority of dwellings were detached houses; apartments accounted for less than 10%. In the same period, over half of all housing units were owner occupied, with smaller percentages either rented or occupied rent free. Dwellings were constructed primarily of either wood or concrete, with a smaller number constructed of both wood and concrete, or stone.