Household Budget Survey (HBS) 
Variation coefficient (VC) of total expenditure according to different classification variables 
VC of total expenditure by educational level of the main breadwinner. 
Unidades: %
;2015;2014;2013;2012;2011;2010;2009;2008;2007;2006;
        Total;0,8;0,8;0,8;0,8;0,8;0,8;0,8;0,8;0,8;0,9;
        Inferior a la primera etapa de Educación Secundaria;2,3;2,6;2,5;2,4;2,3;2,2;2,1;2;1,9;1,9;
        First stage of secondary education and the like;1,7;1,5;1,5;1,6;1,7;1,8;1,8;1,8;2;2,2;
        Second stage of secondary education and non-upper post-secondary education.;2,2;2,2;2,1;2,1;2,2;2,1;2,2;2,4;2,5;2,8;
        Enseñanzas de Formación Profesional de Grado Superior y similares;3,1;3,1;3,1;3,2;3,2;3,2;3,3;3,4;3,7;4;
        Grado (240 ETCS), Diplomatura, Ingeniería Técnica y similares;3,3;3,3;3,4;3,4;3,4;3,5;3,6;3,7;3,8;3,9;
        Grado (más de 240 ECTS), Licenciatura, Ingeniería, Máster, Doctorado;3,3;3,3;3,5;3,6;3,8;3,6;3,7;3,8;3,7;3,9;
Notas:
Until 2014, all university degree programmes were included in a single category ¿Degree (240 ETCS), Undergraduate degree...¿. As of 2015, the level of education follows the National Classification of Education CNED - 2014.
Due to a lack of representativeness, estimates cannot be provided for the cells without data (to points)
Illiterate persons are included in "Lower than first stage of Secondary education" category
Fuente: