http://www.prio.no/Cyprus/Publications/Beyond-Numbers-An-Inquiry-into-the-Political-Integration-of-the-Turkish-Settlers-in-Northern-Cyprus/
It seems to say that the number of true 'settlers' is a lot less than most think it is.
Beyond Numbers also suggests that the discussion on the ‘settler issue’ would benefit from a distinction between those who are temporary residents (among them, numerous ‘guest workers’ and university students) and those who have obtained citizenship – and hence the right to vote – in the ‘Turkish Republic of Northern Cyprus’ (TRNC). While the ‘settler’ label only meaningfully applies to individuals within the latter category, the electoral lists examined for this report indicate that voters originating from mainland Turkey constitute no more than 20–25% of the total electorate in northern Cyprus. ‘Settler’ influence on politics in northern Cyprus is thus both less and less uniform than is often claimed.