Find latest date reported per year in a set of million+ rows over 10 year span

[bssiders]

I have a set of data where I want to find the max date per year.  Somewhat like this:

proc sql;

create table x as select

max(account_date) as last_day format date9.

from y

;quit;

However, the last date per year can vary so instead of grabbing the last date for the entire set, I want to subset by year.  The output would look something like this:

Year   MaxDate

2011   10OCT2011

2012   14NOV2012

2013   31DEC2013

2014   05JUL2014

2015   31DEC2015

.... and so on

There has to be a simple way with a few lines of code vs many.  Any help would be appreciated!

[PaigeMiller]

proc summary data=have nway;
    class year;
    var account_date;
    output out=want max=maxdate;
run;

This assumes you already have a variable named YEAR, if you don't that's easily fixed. 

[bssiders]

your the man!