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: %
;Variation coefficient;;;;;;;;;;
;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;0,9;
        Lower than the first stage of Secondary Education;"";2,6;2,5;2,4;2,3;2,2;2,1;2;1,9;1,9;
        First stage of Secondary education;"";1,5;1,5;1,6;1,7;1,8;1,8;1,8;2;2,2;
        Second stage of Secondary education;"";2,2;2,1;2,1;2,2;2,1;2,2;2,4;2,5;2,8;
        Higher non-university studies;"";3,1;3,1;3,2;3,2;3,2;3,3;3,4;3,7;4;
        First-cycle/degree university studies ;"";3,3;3,4;3,4;3,4;3,5;3,6;3,7;3,8;3,9;
        Second cycle or long cycle university studies, Master¿s degree, doctorate;"";3,3;3,5;3,6;3,8;3,6;3,7;3,8;3,7;3,9;
Notas:
Due to a lack of representativeness, estimates cannot be provided for the cells without data (to points)
As of 2011, the new degree and Master's qualifications have been collected, and the other existing have been renamed. 
Illiterate persons are included in "Lower than first stage of Secondary education" category
Fuente: