select t2.y as y, t2.m as m, case when t2.c<t2.pred then ...

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select t2.y as y, t2.m as m,
case when t2.c<t2.pred then (t2.pred-t2.c)*100/t2.pred end as pr
from (select t1.y as y, t1.m as m, t1.c as c,
(lag(t1.c) over (order by t1.y, t1.m)) as pred
from (select year(creationdate) as y, month(creationdate) as m, count(*) as c 
from posts where posttypeid between 1 and 2 
group by year(creationdate), month(creationdate)) as t1) as t2

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