what are the five most frequent output event until 2102?
select d_items.label from d_items where d_items.itemid in ( select t1.itemid from ( select outputevents.itemid, dense_rank() over ( order by count(*) desc ) as c1 from outputevents where strftime('%y',outputevents.charttime) <= '2102' group by outputevents.itemid ) as t1 where t1.c1 <= 5 )