Moving monthly Total Data / day

all values are listed as: GB

      time  |      up    down
------------+----------------
2009-12-26  |  51.392  68.793
2009-12-27  |  52.325  68.910
2009-12-28  |  53.144  67.405
2009-12-29  |  51.050  62.321
2009-12-30  |  51.980  62.614
2009-12-31  |  53.576  58.931
2010-01-01  |  54.491  56.663
2010-01-02  |  51.393  52.944
2010-01-03  |  50.857  48.837
2010-01-04  |  51.279  46.458
2010-01-05  |  53.953  43.084
2010-01-06  |  56.046  39.676
2010-01-07  |  57.125  37.215
2010-01-08  |  59.552  34.743
2010-01-09  |  62.601  37.102
2010-01-10  |  69.374  38.310
2010-01-11  |  78.144  44.542
2010-01-12  |  78.025  43.117
2010-01-13  |  78.045  42.037
2010-01-14  |  77.010  41.692
2010-01-15  |  76.673  39.549
2010-01-16  |  76.339  39.200
2010-01-17  |  76.061  52.275
2010-01-18  |  75.676  55.663
2010-01-19  |  71.321  55.603
2010-01-20  |  65.365  55.326
2010-01-21  |  64.823  55.672
2010-01-22  |  64.367  56.270
2010-01-23  |  59.932  56.973
2010-01-24  |  59.964  56.833
2010-01-25  |  59.746  56.967
2010-01-26  |  58.093  56.221