Proportion of the population of developing countries with access at each level, in 1990 and 2008, to sanitation and water supply.

Notes: “Unimproved” sanitation facilities are those with no hygienic separation of faeces from human contact; e.g. open pit, platform or bucket latrines. “Improved public” water sources include public taps or standpipes, tube wells or boreholes, protected dug wells and rainwater collection. “Piped water at home” means inside the user's dwelling, plot or yard. Source: [4].