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