Data, data, data?
Do you have your percentages already or not?
Sgplot will plot multiple variables if they share a common x axis. Dummy code of an example:
Proc Sgplot data=have;
series x=date y=percent1;
series x=date y=percent2;
series x=date y=percent3;
run;
You would want to sort the data by date, use nice labels for your percentage variables, use the Yaxis statement to set the label and other appearance items and possibly get into a KEYLEGEND statement to control location of the legend.
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