Apples/oranges. If anything those numbers show a drop in people who believe in evolution, because the previous answers allowed a person to have belief in evolution with God guiding the process. Therefore you would add two separate groups to end up with believers of evolution, those that believed God did not have a hand and those that believed he did. The last gallop poll had the total at 50%.
Hm. Since 1982, the number of people who believe in natural evolution increased by over 55%. The other categories either decreased or remained the same. I wonder if that is meaningful?
A change from 47 to 50 percent is a DROP? You failed math 101.