Intense population growth in the northern states, especially along the US-Mexican border, changed the country's demographic profile in the second half of the 20th century, as the 1967 US-Mexico maquiladora agreement through which all products manufactured in the border cities could be imported duty-free to the US. Since the adoption of NAFTA in 1994, however, which allows all products to be imported duty-free regardless of their place of origin within Mexico, the non-border maquiladora share of exports has increased while that of border cities has decreased. This has led to decentralization and rapid economic growth in Mexican states (and cities), such as Quintana Roo (Cancun), Baja California Sur (La Paz), Nuevo Leon (Monterrey), Querétaro, and Aguascalientes. The population of each of these five states grew by more than one-third from 2000-2015, while the whole of Mexico grew by 22.6% in this period.