I think as molgrips says probably the most interesting thing is the chart particularly the peak in about the 87 and then a drop. In some of the cases the confidence level did reach that peak again until 95.
This does seem to mirror the mid 80’s as being a very confident time for america and the outlook that people should be successful and confident ie yuppy/wall street etc etc.
The drop from 88-92 ish seems to mirror the grunge / alternative outlook where being different/depressed was seen as cooler.
Im not too sure on the economics of the 80’s but it doesnt seem to mirror GDP in anyway.
america uk GDP 1980-1995
In america the only slow down seemed to be between 1990 and 1991. So seems like the chart mirror attitude rather than economics.