Moving monthly Total Data / day

all values are listed as: M pkts

      time  |    total
------------+---------
2009-12-26  |  165.045
2009-12-27  |  164.278
2009-12-28  |  161.990
2009-12-29  |  154.590
2009-12-30  |  156.227
2009-12-31  |  151.230
2010-01-01  |  146.538
2010-01-02  |  138.937
2010-01-03  |  131.943
2010-01-04  |  128.454
2010-01-05  |  125.414
2010-01-06  |  122.190
2010-01-07  |  119.023
2010-01-08  |  115.388
2010-01-09  |  117.894
2010-01-10  |  121.293
2010-01-11  |  134.722
2010-01-12  |  133.173
2010-01-13  |  132.103
2010-01-14  |  130.699
2010-01-15  |  127.738
2010-01-16  |  126.719
2010-01-17  |  140.478
2010-01-18  |  143.899
2010-01-19  |  142.731
2010-01-20  |  140.028
2010-01-21  |  140.803
2010-01-22  |  142.027
2010-01-23  |  141.696
2010-01-24  |  142.571
2010-01-25  |  143.121
2010-01-26  |  142.036