Mexico's Cada Seis A$$os$.$ Mexico was famous$-$or infamous$-$for many years in having two things every six years $($cada seis a$$os in Spanish$)$: a presidential election and a currency devaluation. This was the case in $1976,1982,1988,$ and in $1994.$ In its last devaluation on December $20,1994,$ the value of the Mexican peso $($Ps$)$ was officially changed from Ps$3\mathrm{.}39/$$ to Ps$5\mathrm{.}57/$$$.$ What was the percentage devaluation?

What was the percentage devaluation?

The percentage devaluation is $\%.($Round to two decimal places. A negative change must be entered with a negative sign.$)$