Google Books Ngram Viewer

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

1975 - 1976 1977 - 1983 1984 - 1985 1986 - 1997 1998 - 2000 have often told English
1975 1976 - 1982 1983 - 1989 1990 1991 - 1992 have told often English

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