Filter your data to a 12 month period using a WHERE statement.
I've included 2 samples below, they will evaluate to the same condition. Only one should be included at a time. Depending on your data there may be other ways.
proc means data= mf_encounterdays;
where date between "01Jan2015"d and "31Dec2015"d;
*Where year(date) = 2015;
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