What is the average CTR of a banner?

Obviously it is very difficult to correctly answer this question without generalizing. The CTR depends on a lot, in fact, used by the creativity, dall'appeal the advertiser, the banner format used, the position of banners, etc..

In principle we can say that CTR on the banners is going to decreasing: in 1997, according to data from the IAB network DoubleClick average CTR was 2.1% in 2001 was 0.5% and 0.1% in 2008 . As can be inferred from these data the banners are becoming less effective in generating clicks ... but we must remember, the task is to show a campaign display a message and do not necessarily generate clicks.