Monthly production of Gas in Australia: 

million megajoules. Includes natural gas from July 1989. Jan 1956 - Aug 1995

From Time Series Data Library: http://datamarket.com/data/list/?q=provider:tsdl



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R code to load the data directly:

D <- read.csv("http://gozips.uakron.edu/~nmimoto/pages/datasets/Gas.csv")

D1 <- ts(D[,2], start=c(1956, 1), freq=12)

plot(D1, type='o')




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If you download the file, then save it in your working directry and:

D <- read.csv("Gas.csv")