Encuesta de Fecundidad Characteristics marriages / couples and exposure to pregnancy risk. Women 15-49 years Females between 15 and 49 years size of municipality of residence Cohabitation situation. Unidades: Relative figures ;Total;With spouse;With stable partner in the household;With stable partner out of household;With occasional relations;Another situation; Total;100;51,62;3,81;15,91;4,13;24,54; Up to 10,000 inhabitants;100;57,01;3,65;12,76;3,92;22,66; From 10,001 to 50,000 inhabitants;100;57,42;4,91;15,3;2,17;20,19; From 50,001 to 500,000 inhabitants;100;48,45;3,26;17,25;4,6;26,44; More than 500,000 inhabitants;100;43,62;3,63;17,86;6,08;28,81; Notas: Fuente: National Statistics Institute