select ym,cnt as curr,prev,round(100-cnt*100.00/prev,2) prc

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select ym,cnt as curr,prev,round(100-cnt*100.00/prev,2) prc
   from (
     select ym,cnt,lag(cnt) over (order by ym) prev
       from (
       select year(creationDate)*100 + month(creationDate) as ym, 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 ym

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