Google Books Ngram Viewer

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

1900 - 1911 1912 - 1973 1974 - 1982 1983 - 1992 1993 - 2008 special tax English

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