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What have you tried ? Just as an example, here's a report of db object types created per month for the last year (on a rather idle db;)
select trunc(created,'MM') mm, object_type, count(*) cnt from all_objects where created > add_months(sysdate, -12) group by trunc(created,'MM'), object_type order by 1 desc, 2
In the main dialog (Master), select "Chart" instead of the default "Table" report type,
then in the "Property" tab select your chart type and adjust parameters to your liking.
Thanks, it helped