Tamil speaking group 18.5 %

break down of Tamil speaking population
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Muslims who speak tamil 7.5%
Indian Tamils 7%
Sri Lankan Tamils 4.5%

Wanni Population

LTTE saying 800,000

IDPs counted 193,000, LTTE could have 20,000 - 40,000
number of people who left 75,000
Total Wanni Population 320,000

It has always been a coup to over estimate the tamil population the north, this was done during pre 1983 times as well as now by LTTE for different reasons.

If Total birth rates are 20,000 odd in whole north during one year then how come during ceasefire population increased to 800,000 from 420,000 ?