The number of people with access to safe drinking water rose by 1.6 billion since 1990 — from 4.1 billion in 1990 to 5.7 billion in 2006.
These numbers come from the World Health Organization.
For more information on how the world's health is improving, visit http://www.who.int/research/en/
For detailed information on world health, visit http://www.who.int/whosis/whostat/2009/en/index.html
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