Easy way to see historical trend in keywords in publications? Is there an easy way or existing tool to generate a historical chart with the occurrence of one or more user-specified keyword(s) (combinations) in academic publications, based on the words in the title and/or abstract of a paper?

There is a almost-what-I-was-looking-for tool called Google Scholar Trend Miner, but it seems to be not working anymore, as it reports after hitting Go: "It seems that Google found out that we are a bot and started offering its CAPTCHA. Please, wait some hours and try again"
If you have access to it, you can very easily do that with Thomson Reuters’ Web of Science portal. Run any query you want, probably starting with the simplest one: Topic=XXXX. Then, select “Analyze results” at the top-right bottom-left of the results list, and sort them by year of publication: