In 1997, there were about 3,540,700 housing units nationwide to serve about 3,634,581 households. The average household had4.3 people. At last estimate, more than 60% of housing units were constructed of woven straw, about 15% of cane and woodsticks, and nearly 10% of bricks and concrete. Approximately 65% of all households used well water, nearly 20% river and spring water, almost 10% piped outdoor water, and less than 5% piped indoor water. Nearly 96% were without electricity, and over half had no toilet facilities.