count | no_of_mon | total
-------+-----------+-------
     2 |         6 |  1577
     9 |         7 |  1570
    11 |         8 |  1568
    12 |         9 |  1567
    17 |        10 |  1562
    31 |        11 |  1548
    44 |        12 |  1535
  1162 |        13 |   417
   291 |        14 |  1288

the last col shd be

#
count | no_of_mon | total
#
-------+-----------+-------
#
     2 |         6 |  1579
#
     9 |         7 |  1577
#
    11 |         8 |  1569
#
    12 |         9 |  1558
#
    17 |        10 |  1546
#
    31 |        11 |  1511
#
    44 |        12 |  .
#
  1162 |        13 |  .
#
   291 |        14 |  .

pls see the value difference