select * from

  (SELECT top 12 convert(varchar(7),dateadd(MONTH, -(b3.i + b2.i + b1.i + b0.i), dateadd(month,2,GETDATE())),21) as i FROM (  SELECT 0 i UNION ALL SELECT 1) b0 CROSS JOIN (SELECT 0 i UNION ALL SELECT 2) b1     CROSS JOIN (SELECT 0 i UNION ALL SELECT 4) b2     CROSS JOIN (SELECT 0 i UNION ALL SELECT 8) b3 order by b0.i + b1.i+b2.i+b3.i ) b order by b.i