The institution of slavery was abolished on the island in 1836, as it was throughout the British Empire. After abolition, all former slaves had to serve a four-year "apprenticeship", to accustom them to the idea of freedom. During that period, they worked for their former masters for at least three-quarters of the work week. Full freedom was duly granted by the British in 1838. By that time, people of African ethnicity greatly outnumbered those of ethnic European background. People of Carib descent also comprised a minority on the island.