Luis Reto and Jorge de Sa published a study in 2006 .
According to a study published in 2006 by professors Luís Reto and Jorge de Sá , with the stamp of approval by Instituto Nacional de Estatística and Secretaria de Estado das Comunidades , Benfica has approximately 14 million supporters worldwide : over 5.5 million in Europe ( 4.7 in Portugal ) ; over 6 million in Mozambique ( 3.8 ) and Angola ( 2.7 ) ; over 1 million in the United States and Canada ; and the remainder in Brazil , Venezuela , the Caribbean , Indochina , China , Australia and India .