Google Books Ngram Viewer

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

1800 - 1934 1935 - 1974 1975 - 1979 1980 - 1992 1993 - 2000 showed an upward trend English
1800 - 1960 1961 - 1980 1981 1982 - 1997 1998 - 2000 saw an upward trend English

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