rollback segment waits

HI
 In production database the first day the rollback segment waits is 24 then i increase the number of rollback segments, and applied set transaction use rollback segments(new). But still its waits increases. I made it offline for some time, again it says the same waits about 32.

any body give idea about increasing the waits in rollback segments. How to avoid this?
Maran

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