Msql月度统计问题,求大神解答。

现有统计后的数据;
month recsum total
2015-2 100 100
2015-3 2000 2000
2015-4 150 3000
2015-5 2000 50000

想得到结果:
month recsum total
2015-2 100 100
2015-3 2100 2100
2015-4 2250 5100
2015-5 4250 55100

    SELECT t1.month,
           SUM(t2.recsum) recsum,
           SUM(t2.total) total
      FROM table1 t1
      JOIN table1 t2
        ON t1.month >= t2.month
  GROUP BY t1.month