month        rx      |       tx      |    total
        ------------------------+---------------+---------------
          Oct '06   231,648 MB  |   559,217 MB  |   790,866 MB
          Nov '06   468,305 MB  |   746,248 MB  | 1,214,553 MB
          Dec '06   420,811 MB  | 1,030,692 MB  | 1,451,504 MB
          Jan '07   465,807 MB  |   803,124 MB  | 1,268,931 MB
          Feb '07   492,277 MB  |   620,806 MB  | 1,113,083 MB
          Mar '07   451,074 MB  |   878,371 MB  | 1,329,445 MB
          Apr '07   356,074 MB  |   661,188 MB  | 1,017,263 MB
          May '07   205,452 MB  |   409,782 MB  |   615,234 MB
        ------------------------+---------------+---------------
        estimated   399,102 MB  |   796,025 MB  | 1,195,127 MB