» "Chocolate" (1700-2010): Google Books Ngram Viewer
This is an absolutely amazing tool that Google has developed. You can search for key words in all of Google’s digitized books across history and language and then see the occurrence of that term graphed. Even better, the raw data is available for the kinds of folks who crunch those numbers. This link graphs the word “chocolate” from 1700 to 2010 in Spanish.
