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DECLARE @TagId INT; SELECT @TagId = Id FROM Tags WHERE TagName=##TagName:string##; SELECT DATEFROMPARTS( DATEPART(yyyy, Posts.CreationDate), DATEPART(mm, Posts.CreationDate), 1) AS Month, 100.0 * COUNT(PostTags.PostId) / COUNT(*) AS Pct FROM Posts LEFT JOIN PostTags ON PostTags.PostId = Posts.Id AND PostTags.TagId = @TagId WHERE Posts.PostTypeId = 1 GROUP BY DATEFROMPARTS( DATEPART(yyyy, Posts.CreationDate), DATEPART(mm, Posts.CreationDate), 1) ORDER BY Month;