month        rx      |       tx      |    total
	------------------------+---------------+---------------
	  Jan '07      6350 MB  |      6366 MB  |     12717 MB
	  Feb '07      9956 MB  |      6795 MB  |     16752 MB
	  Mar '07     12037 MB  |     15949 MB  |     27987 MB
	  Apr '07     32001 MB  |     26154 MB  |     58155 MB
	  May '07      9788 MB  |     18035 MB  |     27823 MB
	  Jun '07     16309 MB  |     25731 MB  |     42041 MB
	  Jul '07      2949 MB  |     23365 MB  |     26315 MB
	  Aug '07      3080 MB  |     95409 MB  |     98490 MB
	  Sep '07     11986 MB  |     25895 MB  |     37881 MB