Google Books Ngram Viewer

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

1820 - 1854 1855 - 1970 1971 - 1980 1981 - 1992 1993 - 2000 male teacher English
1820 - 1840 1841 - 1850 1851 - 1892 1893 - 1988 1989 - 2000 female teacher English

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