text: However , because the number of households has been increasing every year , the replacement of total by per-household volume figures produces annual growth rates which are lower than those shown in Tables 1 , 2 and 3 . That is , the positive annual growth rates in Tables 1 , 2 and 3 shrink in Tables 4 , 5 and 6 and the negative rates augment in absolute terms .
  
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  The number of households has been decreasing every year .