with  
Anios as ( 
          select extract(year from sysdate) anio from dual 
union all select extract(year from sysdate) - 1 from dual 
union all select extract(year from sysdate) - 2 from dual 
union all select extract(year from sysdate) - 3 from dual 
union all select extract(year from sysdate) - 4 from dual 
) 
select * 
  from Anios