[Zope-CMF] sum up member properties for specific time period

[Norman Khine]

hello,
how can one, sum up the member properties? for example, i would like to be
able to sum up all the members that had joined the cmf portal within a
specific time period, and get a table like so:


  Date  \  Member Type  |   REVIEWER     |     MEMBER   |  TOTAL
------------------------------------------------------------------------
MAR-03                       |      2                   |           10
|  12
APR-03                       |        4                 |            12
|   16
MAY-03                      |        1                 |            23
|     24
JUN-03                        |       0                 |              2
|      2
-------------------------------------------------------------------------
TOTAL                      |             7            |               47
|      54


thanks

norman