Google Books Ngram Viewer

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

1860 - 1930 1931 - 1987 1988 - 1994 1995 - 2002 2003 - 2008 oldest profession English
1860 - 1881 1882 - 1932 1933 - 1938 1939 - 1978 1979 - 2008 ancient profession English

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