Percentage of accepted answers over time by month

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Select 67 - Datediff(month, p.CreationDate, Current_Timestamp) as Age,
       convert(DECIMAL(10,2), sum(case when p.AcceptedAnswerId is null then 0
                                       else 1
                                  end)
               ) / count(p.Id) as PercentAccepted
From Posts p
Where p.PostTypeId = 1
Group by Datediff(month, p.CreationDate, Current_Timestamp)
Order by Datediff(month, p.CreationDate, Current_Timestamp) desc

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