Google Books Ngram Viewer

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

1960 - 1974 1975 - 1987 1988 1989 - 1999 2000 synced English
1960 - 1976 1977 - 1997 1998 1999 2000 synched English

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