$$Mexico$\text{'}$s Cada Seis$$ A$$os$.$Mexico was famouslong dash$$or infamouslong dash$$for many years for having two things every six years $($cada seis$$ a$$os in$$ Spanish$)$: a presidential election and a currency devaluation. This was the case in$1976,1982,1988,$ and $1994.$ In its last devaluation on December$20,1994,$ the value of the Mexican peso$($Ps$)$ was officially changed from Ps $3\mathrm{.}30$ equals $ $1\mathrm{.}00$Ps $3\mathrm{.}30=$$$1\mathrm{.}00$ to Ps $5\mathrm{.}50$ equals $ $1\mathrm{.}00$Ps $5\mathrm{.}50=$$$1\mathrm{.}00.$ What was the percentage$$ devaluation?