Approval for spanking is on the decline: Since 1986, the GSS has asked Americans if they feel that spanking is sometimes necessary. I looked the percent who said no:
Percent thinking that spanking is not necessary
There was a jump in the late 80s, but it has leveled off in the past decade. This matches the trend I have witnessed in the classroom: more people seem to be uncomfortable with not only spanking, but also punishment in general. I could count on one hand the number of times I have spanked my kids, but no punishment? You gotta be crazy. No wonder we have so many poorly behaved kids.