Encuesta de Fecundidad Preferences and motivations in terms of size of the family. Females, between 15-49 years. Females who have had more children than desired reason why they had more children actual age (years). Units: relative figures ,Total,From 15 to 29 years old,From 30 to 39 years old,From 40 to 49 years old, Failure of contraception used,61.57,54.30,72.85,57.77, Lack of knowledge of contraceptions,19.94,4.37,4.04,27.42, Others,23.92,41.33,27.66,21.03, Notes: Source: National Statistics Institute