Percentage of deleted questions (breakdown by year when created)

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Constructed Languages

Q&A for designers and users of artificial or invented languages, consciously developed instead of having developed naturally

SELECT YEAR(CreationDate) AS [Year],
ROUND((COUNT(DeletionDate))*100.0/(COUNT(*)),2) AS percentage
FROM PostsWithDeleted
WHERE PostTypeId=1
GROUP BY YEAR(CreationDate)
ORDER BY YEAR(CreationDate)
---Posts which are not deleted have DeletionDate NULL
---So COUNT(DeletionDate) only counts Deleted Posts

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