How to pull client data usage for past month via API?

Hi,

How can I pull client data usage for past month using API (OnPremise)? All historical connections.
I'm trying with with /v1/monitor/devices but I'm not getting data for all the clients when I use startTime and endTime.

API call I'm trying: xapi/v1/monitor/clients/?ownerId=xxx&startTime=2017-11-01T00:00:00.000Z&endTime=2017-11-30T00:00:00.000Z