Select DISTINCT(yr) from (select year(issue_date) as yr, issue_date from paper_master,printsize_master,stamps where issue_date!='' and  paper_master.paper_code=stamps.paper_code and paper_master.paper='All over multiple 'Lion Capitol of Ashoka''  and printsize_master.printsize_code=stamps.printsize_code and printsize_master.printsize='2.99 x 2.1'  order by issue_date) t