Click here to see the SAS code.
Click here to see the example.

This one looks kinda "funky", but is actually a kinda neat way
of showing several years of monthly data.

Since there was no sas/graph proc that does this, I basically 
created it all with annotated 'pie' slices.  I annotate a 
large pie for the outer year, and each slice is 1/12th of the
360 degree pie (since there are 12 months in a year).  I color-
code the slices based on the data values, and I use the annotate
data set's "html" variable to hold my html title= charttip/flyover-
text information with details about that year/month's data.

Then, for each additional year, I decrease the radius and draw
another 12-slice pie on top of the larger pie, until I run out
of years.

Then I annotate some text labels, and annotate a color legend.

Since this is totally annotate (with no plot or map) I use
sas/graph "proc sglide" to display the annotateion.

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