Encuesta de Fecundidad Characteristics marriages / couples and exposure to pregnancy risk. Women 15-49 years Single females who have had a partner, who 1st relation finished size of municipality of residence duration of the 1st relation (years). Unidades: Absolute figures ,Total,Under 5 years old,From 5 to 9 years old,From 10 to 14 years old,From 15 to 19 years old,20 years old and over, Total,663.335,640.548,10.372,3.608,8.806,.., Up to 10,000 inhabitants,82.408,79.253,3.155,..,..,.., From 10,001 to 50,000 inhabitants,143.145,141.290,1.855,..,..,.., From 50,001 to 500,000 inhabitants,301.668,284.782,4.473,3.608,8.806,.., More than 500,000 inhabitants,136.114,135.223,890,..,..,.., Notas: Fuente: National Statistics Institute