with a svg version Created by using gnuplot 4.4 patchlevel 0-rc1 (it allowed me to modify font size of the key which the current stable release does not) Script:

set terminal svg enhanced fname "Helvetica" fsize 10 size 600 500
set output "AustralianReligiousAffiliation.svg"
set style histogram rowstacked
set boxwidth .7 absolute
set style fill solid 1.0 border -1
set style data histograms
set yrange [0:100]
set ylabel "% self-describing religious affiliation"
set xlabel "Census Year"
set key outside bottom right horizontal font "Helvetica,8"
set title "Major religious affiliations described in Australian censuses" font "
Helvetica,14"
plot 'australia.data-2' \
using 2 t "Anglican" fs pattern 2 lc rgb "blue" , \
'' using 3 t "Catholic" fs pattern 5 lc rgb "red" , \
'' using 4 t "Other Christian"  fs  pattern 1 lc rgb "gray" , \
'' using 6 t "Other religions" fs solid lc rgb "yellow", \
'' using 7 t "No religion" fs pattern 4 lc rgb "green", \
'' using 8:xtic(1) t "Not stated/inadequately described"  fs pattern 3 lc rgb "purple"