How many posts did Jay Stevens have in 2010?
DisplayName = 'Jay Stevens'; in 2010 refers to YEAR(CreationDate) = 2010;
SELECT COUNT(T1.Id) FROM users AS T1 INNER JOIN posts AS T2 ON T1.Id = T2.OwnerUserId WHERE STRFTIME('%Y', T2.CreaionDate) = '2010' AND T1.DisplayName = 'Jay Stevens'