Google Books Ngram Viewer

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

1968 - 1971 1972 - 1978 1979 - 1980 1981 - 1999 2000 - 2008 property tax English
1968 - 1975 1976 - 1994 1995 - 1997 1998 - 2005 2006 - 2008 service tax English

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