select mm,cnt as curr,prev,round(100-cnt*100.00/prev,2) p...

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select mm,cnt as curr,prev,round(100-cnt*100.00/prev,2) prc  from (select mm,cnt,lag(cnt) over (order by mm) prev     from (select year(creationDate)*100+month(creationDate) as mm,             count(1) as cnt        from posts       where PostTypeId between 1 and 2       group by year(creationDate)*100+month(creationDate) ) A ) A where cnt < prev order by mm;

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