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 level of studies and number of live births. Units: relative figures ;Total;None;One;Two;Three;Four;Five and more; Total;100.00;84.24;4.56;7.56;2.68;0.49;0.47; Illiterate;100.00;49.69;..;..;10.19;9.18;30.94; Without studies;100.00;29.25;9.61;22.53;20.53;10.47;7.60; Primary education and second grade, GBE or first year of GCSE;100.00;77.49;6.58;11.41;3.82;0.51;0.18; Secondary Education and Post-secondary non-higher;100.00;94.62;2.04;2.48;0.61;0.14;0.11; 1º, 2º and intermediate technical-professional studies;100.00;90.49;3.32;3.58;2.19;0.10;0.32; Higher level technical-professional studies;100.00;97.04;2.96;..;..;..;..; First year of tertiary education;100.00;89.74;4.39;4.69;1.18;..;..; Tertiary education, university graduates and doctors;100.00;90.40;1.39;6.77;..;..;1.44; Notes: Source: National Statistics Institute