Google Books Ngram Viewer

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

1950 - 1971 1972 - 1979 1980 - 1981 1982 - 1997 1998 - 2000 drug party English
1950 - 1970 1971 - 1996 1997 1998 1999 - 2000 drugs party English

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