The gravitational weight of cities located in the central section of the country fell from 78.4% in 1966 to 67.8% in 1986, and to 48.3% by 2006, entailing a total decrease of 30.1% over these 50 years.
El peso gravitacional de las ciudades de la franja central se redujo de 78.4% en 1966, a 67.8% en 1986, y a 48.3% en 2006, lo que significa una baja de 30.1% durante los 40 años.