sentences:  All this prosperity ended when the over-supply of oil in early 1982 caused oil prices to plummet and severely damaged the national economy.Interest rates skyrocketed in 1981 and external debt reached 86 billion dollars and exchange rates went from 26 to 70 pesos per dollar and inflation of 100%.This situation became so desperate that Lopez Portillo ordered the suspension on payments of external debt and the nationalization of the banking industry in 1982 consistent with the Socialist goals of the PRI.