Google Books Ngram Viewer

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

1800 - 1965 1966 - 1995 1996 - 1997 1998 - 1999 2000 autism English
1800 - 1833 1834 - 1907 1908 - 1921 1922 - 1986 1987 - 2000 symptoms English

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