select x.year y, x.month m, 100 - cast(x.posts as money)/...

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Portuguese Language

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select x.year y, x.month m, 100 - cast(x.posts as money)/cast(x1.posts as money)*100 perc from
(select Year(CreationDate) year, Month(CreationDate) month, Count(PostTypeId) posts
from Posts group by Year(CreationDate) , Month(CreationDate)) x
join (select Year(CreationDate) year, Month(CreationDate) month, Count(PostTypeId) posts
from Posts group by Year(CreationDate) , Month(CreationDate)) x1
on x.year =x1.year and x.month - x1.month = 1 and x.posts < x1.posts order by y,m;

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