Up-to-date statistics on racial or ethnic origins are not available. In 1981, the vast majority of Dominicans (91%) were descendants of African slaves brought to the island in the 17th and 18th centuries. Some 6% of the population was of mixed descent, and a small minority of about 0.5% was of European origin. Dominica is the only island of the Caribbean on which descendants of the Carib Indian population still make up a community of significant size. Isolation and the establishment of a 1,500-hectare (3,700-acre) reserve have enabled the Caribs, who number about 3,000 people, to preserve their identity.