Mexico's Cada Seis Aos. Mexico was famous-or infamous-for many years for having two things every six years (cada seis aos in Spanish): a presidential election and a currency devaluation. This was the case in 1976, 1982, 1988, and 1994. In its last devaluation on December 20,1994 , the value of the Mexican peso (Ps) was officially changed from Ps 3.30 / $ to Ps 5.50/$. What was the percentage devaluation? The percentage change in the peso versus the dollar was \%. (Round to two decimal places.)