Encuesta de Fecundidad Knowledge and use of contraceptions. Fem. between 15-49 Females between 15 and 49 years, have not used or use contraceptions by levelof studies and number of live births. Unidades: relative figures ;Total;None;One;Two;Three;Four;Five and more; Total;100;84,24;4,56;7,56;2,68;0,49;0,47; Illiterate;100;49,69;..;..;10,19;9,18;30,94; Without studies;100;29,25;9,61;22,53;20,53;10,47;7,6; Primary education and second grade, GBE or first year of GCSE;100;77,49;6,58;11,41;3,82;0,51;0,18; Secondary Education and Post-secondary non-higher;100;94,62;2,04;2,48;0,61;0,14;0,11; 1º, 2º and intermediate technical-professional studies;100;90,49;3,32;3,58;2,19;0,1;0,32; Higher level technical-professional studies;100;97,04;2,96;..;..;..;..; First year of tertiary education;100;89,74;4,39;4,69;1,18;..;..; Tertiary education, university graduates and doctors;100;90,4;1,39;6,77;..;..;1,44; Notas: Fuente: National Statistics Institute