&gt; percent of people who have access to clean water<p>This number is actually measured, because it is target 7.C of MDG(Millennium Development Goals). Lots of data at <a href="http:&#x2F;&#x2F;mdgs.un.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;mdgs.un.org&#x2F;</a>.<p>Summary is that we are doing very well on this number. In 1990 it was 76%, now it is 91%. In the absolute number, 2.6 billion people gained access to clean water in the period.