instruction: Closed questions that have answers for year 2020.
response: SELECT AnswerCount, COUNT(1) FROM (SELECT PostId FROM PostHistory WHERE PostHistoryTypeId = 10) AS Hist INNER JOIN (SELECT Id, AnswerCount FROM Posts WHERE PostTypeId = 1 AND YEAR(CreationDate) = 2020) AS Post ON Hist.PostId = Post.Id GROUP BY AnswerCount ORDER BY AnswerCount