Huh, something's wrong with that link. Should be: https://books.google.com/ngrams/graph?content=open+source&case_insensitive=on&year_start=1990&year_end=2008&c

Huh, something's wrong with that link. Should be: https://books.google.com/ngrams/graph?content=open+source&case_insensitive=on&year_start=1990&year_end=2008&corpus=15&smoothing=0&share=&direct_url=t4%3B%2Copen%20source%3B%2Cc0%3B%2Cs0%3B%3BOpen%20Source%3B%2Cc0%3B%3Bopen%20source%3B%2Cc0%3B%3BOpen%20source%3B%2Cc0 https://books.google.com/ngrams/graph?content=open+source&ca...