How may i know that user clicked on which Add

Hey friends,

Using adsense for last couple of months . But i get very few $$[$0.10---$0.20] for every clicks whereas CPC are $1+ i know google takes 33% of CPC and some further calculation are alsoin placed with CTR and so oN..... But main question is how may i know from which page the user clicked on the Add ???

Thank-you guys .....