Google Books Ngram Viewer

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

1800 - 1858 1859 - 1963 1964 - 1973 1974 - 1985 1986 - 2000 chairman English
1800 - 1978 1979 - 1992 1993 - 1994 1995 - 1996 1997 - 2000 chairperson English

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