On Dashboard, if you go to Network-wide > Monitor > Clients, you willsee the option to download the contents of client usage in both CSV and XML formats. If you only need to see the detail for one particular client, feel free to use the search box to filter and show only that one. You can also use the + sign on the right-hand side of the page to add more columns to it, and then extract more information in your report.
For more details about any of those processes, refer to the nice KB article that I am listing below:
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