tnem<-ts(employment,start=c(1980,1),frequency=12)<br />
png('unem.png',width = 1200, height = 600)<br />
par(col.lab=4,xaxs='i')<br />
plot(tnem,main='UNEMPLOYMENT',xlab='Month',ylab='',col=2,<br />
lwd=2,col.main=4,axes=F,panel.first=grid(nx=11,ny=4,lwd=2))<br />
axis(2);box()<br />
axis(1,at=seq(1980,2010,3))<br />
dev.off()<br />
</p>