Optimism in the past

It is often said that people today are far less optimistic about the future than they were in the past. It is particularly common to associate “optimism” with the 50’s and 60’s. Some quick Google searches on the phrase “optimism in the 19XX's/XX's/XXties” also show this. But I was surprised that “optimism” was not more prevalent in descriptions of the nineties, have we already forgotten about the Wind of Change?


[Methodological disclaimer: it is worth noting that part of the "optimism" may not be about each decade as such but rather about more specific things that happened in that decade]