The length of periods are given as the parameter "h".
library ( forecast)
am <- auto.arima( PA[k1992], ic="aic", trace=T, stepwise=F, approximation=F, start.p=0, start.q=0, start.P=0, start.Q=0)
forecast ( am , level = c( 50,95), h = 12)
am <- auto.arima( PA[k1992], ic="aic", trace=T, stepwise=F, approximation=F, start.p=0, start.q=0, start.P=0, start.Q=0)
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