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: Relative 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 100 96,56 1,56 0,54 1,33 .. Up to 10,000 inhabitants 100 96,17 3,83 .. .. .. From 10,001 to 50,000 inhabitants 100 98,7 1,3 .. .. .. From 50,001 to 500,000 inhabitants 100 94,4 1,48 1,2 2,92 .. More than 500,000 inhabitants 100 99,35 0,65 .. .. .. Notas: Fuente: National Statistics Institute