The share of the total population with access to improved sanitation facilities versus gross domestic product (GDP) per capita, measured in 2011 international-$. Improved sanitation facilities are likely to ensure hygienic separation of human excreta from human contact. They include flush/pour flush (to piped sewer system, septic tank, pit latrine), ventilated improved pit (VIP) latrine, pit latrine with slab, and composting toilet.
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