Ethnic groups are grouped into minorities and constitutive peoples in Yugoslavia and in 28 years the top 2 ethnic groups were the Serbs and Croats.
The ethnic groups in Yugoslavia were grouped into constitutive peoples and minorities. Serbs Croats 7,065,923 (41.7%) 3,975,550 (23.5%) 7,806,152 (42.7%) 4,293,809 (23.1%) 8,143,246 (39.7%) 4,526,782 (22.1%) 8,136,578 (36.3%) 4,428,135 (19.7%) 
