使用条形图，Y轴为百分比

Question

Gretings

我需要更改y轴以百分比显示的条形图。这是我的代码：

grafico=barplot(as.matrix(w),las=2,beside=T, horiz=F,,ces.names=1.5,col=c("lightblue","lightgrey","darkgrey"),cex.axis=1, cex.names=0.78, main = "Figura 2. Vivienda")
legend(20,20, row.names(w), col=c("lightblue","lightgrey","darkgrey"),cex = 0.75,lwd=5)

这就是我现在所拥有的：

谢谢！