Looking at income, in Figure 2, it appears that in 1990, regions with income superior to the 75% interquartile range were located primarily in the north of the country.
En torno a los ingresos salariales se observa, en los mapas de la figura 2, que para 1990 las regiones con ingresos superiores al rango-intercuartil del 75%, se ubicaban principalmente en la región norte del país.