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select _year, _month, (a - b + 0.0) / a * 100 as _res
from (
  select _year, _month, _count as b, lag(_count) over (order by _year, _month) as a
  from (
    select year(CreationDate) as _year, 
           month(CreationDate) as _month, 
           count(id) as _count
    from Posts
    group by year(CreationDate), month(CreationDate)
  ) q
) q2

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