Google Books Ngram Viewer

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

1800 - 1836 1837 - 1966 1967 - 1978 1979 - 1989 1990 - 2000 preventive English
1800 - 1816 1817 - 1978 1979 - 1987 1988 - 1995 1996 - 2000 preventative English

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