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"Percentage of people in the Third World with access to drinking water and sanitation, 1970–2000. Light, broken lines indicate individual, comparable estimates, solid lines is a logistic best fit line – a reasonable attempt to map out the best guess of development among very different definitions. Source: World Bank 1994:26 (1975–90), WHO 1986:15–18 (1970–83), Gleick 1998:262, 264 (1980–90, 1990–4), Annan 2000:5 (1990–2000)."
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