Of the 16,349 people groups, how many are considered 'unreached'?

Of the 16,349 people groups, how many are considered 'unreached'?
6,644
255  78.7%
4,300
40  12.3%
2,300
23  7.1%
600
6  1.9%

Number of Voters  :  324
First Vote  :  Friday, 23 April 2010 18:59
Last Vote  :  Sunday, 09 January 2011 21:42
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Bible verse

Then will I purify the lips of the peoples, that all of them may call on the name of the Lord - Zephaniah 3:9