Crystal Reports how to show subtotal in columns?

Message

   I have a table InstallmentPayment that contains 3 fields. i.e,

SubscriberId   PaymtDate      PaymtAmount

---------------------------------------------------

       1               31/01/03         500

       1               31/06/03         500

       1               31/01/04         600

       1               31/01/04         600

       2               31/01/03         1000

       2               31/06/03         1000

       2               31/01/04         1000

       2               31/06/04         1000

Subscribers pay installment amount for several years. I want to show the payment total for each year of every Subscriber in a single row for a subscriber. i.e

SubsId   Paymt2003 Paymt2004  

------         --------       ---------    

     1        1000             1200      

     2        2000             2000              

How can I solve it?

Thanks in advance for reply.

------

Hamid