function [MM] = exctractdec (M)

s = size (M);
n = s (1);

MM = [];

for i = 1 : n
    
    year = M (i,1);
    month = M (i,2);
    day = M (i,3);
    hour = M (i,4);
    
    var = M (i,5);
    
    if month == 12
        
        MM = [MM;year,month, day, hour,var];
        
    end 
    
end