Low Click Ratio

Hi All, I am using "Responsys" tool. We have receiving the good numbers of "Opens" for campaigns but "Click ratio" is low. Example: There is "1000 Opens" for a campaign but we have received only "8 to 10 Clicks". If 1 click per email that means it should be 1000 clicks, 1000 opens = 1000 clicks. If we are talking about average clicks that means 1000 opens should receive at least 50 to 60% of clicks (Nearly 500 to 600 Clicks). But we are receiving 1000 opens and 8 to 10 clicks. Does anyone know why? Is there any coding issue? or any setting need to be done in tool? Regards, Munikrishna