2013 Top Billed and Top Paying Clients

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Hello. I am trying to run two reports: one is top ten billed clients for 2013; and top ten paying clients for 2013. 

I have run reports which show the highest check amount but not total paid for the year. I have also run reports which show the highest invoice values but not total for the year. 

Could you inform me as to what reports to run and the parameters? I am using Timeslips 2008.

Thank you