SELECT Count(Id), Calendar_Year(CloseDate), Calendar_Month(CloseDate) FROM Opportunity WHERE Stage = 'Closed Won' GROUP BY Calendar_Year(CloseDate), Calendar_Month(CloseDate) ORDER BY Count(Id) DESC
SELECT Count(Id), Calendar_Year(CloseDate), Calendar_Month(CloseDate) FROM Opportunity WHERE Stage = 'Closed Won' GROUP BY Calendar_Year(CloseDate), Calendar_Month(CloseDate) ORDER BY Count(Id) DESC