I get the values like this
lynx -dump http://base.debian.net/ |grep "Release Critical" |head -1 |rev |awk '{print $2}' |rev >>base.dat
lynx -dump http://standard.debian.net/ |grep "Release Critical" |head -1 |rev |awk '{print $2}' |rev >>std.dat
lynx -dump http://bugs.debian.org/release-critical/ |grep "release-critical bugs" |head -1 |rev |awk '{print $1}' |rev >>total.dat
lynx -dump http://www.debian.org/devel/wnpp/requested |grep requested |wc -l >>requested.dat
and generate the stats using gnuplot
#!/usr/bin/gnuplot
set size 640.0/640, 360.0/480
set terminal png color
set output "woody.png"

set multiplot
set nokey
set yrange [0:450]
set xtics 0,5
set ytics 0,30
set grid
set xlabel "timeline"
set ylabel "open rc bugs"

plot "base.dat" with lines
replot "std.dat" with lines linetype 3
replot "total.dat" with lines linetype 8
replot "requested.dat" with lines linetype 4