Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1809 1810 - 1816 1817 - 1843 1844 - 1930 1931 - 2000 profess English
1800 - 1859 1860 - 1973 1974 - 1982 1983 - 1991 1992 - 2000 professional English

Run your own experiment! Raw data is available for download here.
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