Take with a grain of salt...

...but I find this graph from Indeed of trending in chemist job ads to be pretty close to reality. While we might quibble with some of the details, I think it jibes with my general sense of things. (Thanks to @kromablography for finding this.)

The trends for "biochemist", though, tends to make me a little bit suspicious of Indeed's data set -- I suspect it to be a change in their search algorithm, as opposed to a ten-fold increase in demand for biochemists.