It is not known exactly how many people of each ethnicity live in Réunion, since the French census does not ask questions about ethnic origin, which applies in Réunion because it is a part of France in accordance with the 1958 constitution. The extent of racial mixing on the island also makes ethnic estimates difficult. According to estimates, Whites make up roughly one quarter of the population, Malbars make up more than 25% of the population and people of Chinese ancestry form roughly 3%. The percentages for mixed race people and those of Afro-Malagasy origins vary widely in estimates. Also, some people of Vietnamese ancestry live on the island, though they are very few in number.